UKIP has unveiled its policy on immigration.
It's a big part of their campaign.
Party leader Nigel Farage says he wants immigration back to "normal" levels.
What does that mean?
There have been a lot of numbers flying around.
We've broken down some key statistics for you.
UKIP's policy
Net migration is the difference between the number of people moving into and out of the country.
UKIP want an "Australian-style points-based visa system" which they say will ensure only skilled workers are allowed into the country.
Current net migration: 298,000
What UKIP want to reduce it to: Between 20,00 and 50,000
What immigration figures were at the last election
In 2010 net migration stood at 256,000.
Current net migration 298,000
298,000 is the net migration figure to the UK for the year up to September 2014.
That's up 88,000 from the year before - a "significant" increase, according to the Office for National Statistics. Additionally it's up 46,000 from the last election.
But that number is still below the peak of 320,000 which was recorded in the first half of 2005.
Other things you might find interesting about immigration in 2010:
591,000 people came to the UK. That's roughly the same number of people who live in Belfast.
Half of those came here to study and education is the most common reason for people to come to the UK.
339,000 left the UK, the lowest number in 25 years.
Socking it: Farage wore special UKIP socks for today's immigration policy launch
What David Cameron promised
Current net migration: 298,000
What David Cameron said he would reduce it to in 2011: 'tens of thousands' (up to 100,000)
In 2011, the prime minister promised to get net migration down to "tens of thousands" each year.
At first it looked as though that target might be hit.
Immigration began to fall during 2011 because of policies like cracking down on "bogus" colleges and making fewer non-EU visas available.
But the worsening economic situation across Europe meant that people from countries like Spain and Portugal began to head to the UK in search of work.
Chancellor George Osborne says that the target still stands.
"Your hair!" David Cameron and Theresa May compare passport photos
EU or non-EU?
Net migration from EU: 251,000 people
Net migration from the rest of the world: 292,000 people
The number of people coming to the UK from outside the EU is higher than those from non-EU countries.
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