Many of them are in charge of government departments like the Department of Health or the Department for Education.
The most senior figures in the Cabinet are the Prime Minister, the Chancellor of the Exchequer, who is in charge of the country’s finances, the Home Secretary, who is responsible for the country’s internal affairs such as immigration, the police and matters of national security, and the Foreign Secretary, who takes care of all the UK’s affairs overseas.
The Cabinet meets up once a week to discuss government policy.
Occasionally, the Prime Minister changes who does what job within the Cabinet and can fire politicians or promote them to the Cabinet. This is what they mean by a ‘Cabinet reshuffle’.