You could have to carry a special ID card in the future, with plans to make all 60m UK citizens carry them.
As well as information like your name and date of birth they'll also carry a special code that will record a scan of your eye and your fingerprints.
The government say the cards will help keep the country secure from terrorism.
But not every one is happy with the plans, as some people think the cards will hold too much information and are against human rights.
A plan to practice the scheme using 10,000 volunteers starts on Monday, and it's hoped 80% of people will be carrying them by 2008.