Backstop? Canada plus? The Chequers plan?
These are just some of the words being used by politicians about Brexit and the negotiations between the UK and the EU - with our exit from the European Union imminent, the amount of jargon only seems to be growing.
For those of you confused by the language around Brexit, here's our guide to what all the key terms actually mean:
If it was a competition, 'backstop' would win the prize for the most used, least understood word to have been borne out the negotiation process.
It's a complex term relating to the post-Brexit border between the Republic of Ireland and Northern Ireland - it is also the main sticking point in negotiations.
As things stand, goods and services can pass between the two nations with few restrictions, because both are part of the single market and customs union (explained later).
However, when the UK finally leaves the EU, things could be very different.
If customs arrangements cannot be agreed upon by the end of the transition period in December 2020, the backstop will come into place to avoid a hard border on the island of Ireland - something neither side wants.
It is effectively a safety net that, for a limited time, will keep Northern Ireland part of the single market and customs union, meaning the cross-border Irish relationship will remain the same.
Both sides have already agreed on the need for a backstop but cannot find common ground on what form that backstop should take.
The EU wants the backstop to mean that only Northern Ireland can remain in the single market and customs union, which would effectively create a border between Northern Ireland and the rest of the UK - a red line for Theresa May.
The UK wants the backstop to mean that Northern Ireland and the rest of the UK remains within the single market and customs union for a limited period of time following the transition period - a red line for the EU.
The issue of the backstop is such a sticking point for the EU that they won't allow the transition period to begin before it can be agreed upon where a safety net should be placed.
- Chequers plan
Chequers is the name of the Prime Minister of the United Kingdom's country house, located in Buckinghamshire - but it has also become synonymous with Theresa May's seemingly doomed plan for Brexit.
It is called the Chequers plan because it was agreed upon during a cabinet meeting inside the historic country residence. The agreement resulted in the resignation of two Brexit poster boys - David Davis and Boris Johnson.
They initially agreed to Chequers but changed their mind after deciding it was proposing a version of Brexit much 'softer' than they wanted.
The Chequers plan centres around the need for the UK and EU to agree to a "common rule book" that will allow a "free trade area for goods".
The common rule book means the UK would still follow standards and rules created by the European Union. This would mean, for example, that the UK continues to commit to consumer protection standards and EU case law.
Theresa May wants to create a free trade area to "avoid friction at the border, protect jobs and livelihoods, and ensure both sides meet their commitments to Northern Ireland and Ireland".
The plan includes a "facilitated customs agreement," set up to avoid customs checks at EU-UK borders, meaning the UK would still have access to the EU single market. It would also end free-movement of people.
The EU have already said Chequers "will not work" because of the access it will give the UK to the single market without agreeing to the four freedoms: movement for goods, services, capital and people.
Many Tories don't agree to the plan because they believe it would result in the UK continuing to answer to the EU.
- Customs union
Every European Union member nation is part of the customs union, which means there are no customs checks when goods pass between EU states.
Another feature of the customs union is that goods entering the EU from the rest of the world are subject to a "common external tariff", which is set by European Union institutions, not individual countries.
This also means that the EU decides how to spend revenue collected from tariffs and most of it goes into the EU budget.
The reason politicians want Britain to leave the customs union is so the UK can strike its own trade deals.
- Single market
To be part of the single market, nations must agree to the 'four freedoms'; free movement of people, capital, goods and services.
In return, countries get access to goods and services passing between member states without having to pay tariffs.
- Hard Brexit
Tory politicians such as David Davis and Boris Johnson believe a 'hard Brexit' is what the public voted for two years ago.
A hard exit from the European Union would see the UK lose access to the single market, the customs union and all EU institutions.
It will give the UK more freedom and ability to strike trade deals with countries all over the world that are not part of the EU trading bloc.
Many critics say the downside to a hard Brexit is that the UK would lose its trading relationship with the EU and fall back onto World Trade Organisation (WTO) rules, meaning increased tariffs on goods.
Tariffs are a tax or duty imposed by governments on goods and services imported from other countries. Imposing tariffs on imports makes them more expensive and makes domestic goods and service more attractive.
- Soft Brexit
Many politicians who campaigned for the UK to remain in the EU before the referendum now believe a 'soft Brexit' is the best option for Britain.
A soft Brexit is widely perceived to be a deal that will keep the UK closely aligned with the EU after it leaves - including retaining access to the single market and parts of the customs union, allowing some sectors to trade without having to pay tariffs.
This model means the UK would still pay into the EU budget and continue to accept the four freedoms, but without any say in the EU decision making process.
Critics of a soft Brexit it say it would result in BRINO - Brexit In Name Only - and they don't believe that is what the public voted for.
- Canada plus
Former Brexit Secretary David Davis has an alternative to Theresa May's Chequers plan called 'Canada plus'.
The plan is based on the free trade deal struck between Canada and the EU, known as CETA, that took seven years to negotiate.
CETA means there are no tariffs on most goods and services passing between Canada and the EU, except on items such as food and agriculture.
This gives Canada access to nearly all of the European market without actually being part of the single market. They also don't have to contribute to the EU budget or follow EU laws.
David Davis' idea of Canada plus would give the UK a deal very similar to CETA, but with increased access to the single market in areas that could impact the British economy, such as financial and energy markets.
The downside of this plan is that it may result in the UK continuing to contribute to the EU budget.
On top of this, the Canada plus idea could be seen as cherry-picking, something the EU has said it will not allow.
- Norway style deal
Another alternative to the Chequers plan is to follow the style of Norway's relationship with the EU - which would be seen as having a soft Brexit.
A Norway style deal would see Britain join the European Economic Area (EEA) which means it would remain part of the single market and continue to pay into the EU budget, without having a say in decision making.
Norway also has to follow the majority of EU laws and accepts freedom of movement.
It is unlikely this option could ever become a reality because it crosses many of the Government's red lines, such as continued free movement of people.
- Article 50
The formal legal process for leaving the European Union is detailed in Article 50 of the Lisbon Treaty, which became law in December 2009.
Article 50 is only five paragraphs long and focuses on the exact way a nation can leave the EU.
It states that any member can withdraw from the Union and when it decides to do so it must inform the European Council before negotiating the terms of its exit.
Once a decision has been triggered the country leaving the EU has a two year period in which it must reach an agreement on its departure. An extension of the two years may be granted only if all member states agree.
Once the two year period begins, the nation leaving the Union is exempt from discussions relating to its departure. The departure must be approved by a "qualified majority" of members.
If a state that has left the EU wishes to rejoin, Article 50 outlines that it must apply for membership in the same way as any other country.