"The Foundation licence is your gateway to the world of amateur radio

The course and exam that leads to the licence provides you with an exciting introduction to the hobby while ensuring you can operate safely and without causing issues to other radio users. The licence entitles you to a unique call sign which you use to identify yourself when transmitting.

Foundation licences are issued by Ofcom, the UK’s communications regulator."

From:

https://rsgb.org/main/clubs-training/for-students/foundation/