Being looked after by someone who isn't your mum, dad or carer can sometimes be called private fostering or fostering.
Private fostering is when a child under the age of 16 (under 18 if disabled) is cared for by someone who is not their parent or a close relative. This is a private arrangement that lasts more than 28 days and is made between a parent and a carer.
By law, your local authority must be told about all private fostering situations. - See more here.
If you or one of your friends is a child living with foster parents, it can include a lot of changes such as a different place to live, maybe a change of school, with new children and new teachers to get to know.
Sometimes it can be really hard, and the child or young person may also feel really worried or upset about their parents or carers.