A semicolon (;) can be used in lists. A semicolon can separate longer phrases in a list that has been introduced by a colon, or which is more complicated than a simple list of words.
There was a lot of work to do in the garden: the grass to cut; hedges to trim; flower beds to weed; trees to prune and the vegetable patch to plant.
For the camping trip the children need to bring with them: a hot water bottle or extra blanket in case it gets cold; waterproof clothing for if it rains; a plastic cup, plate and bowl; their own cutlery and a small rucksack for walks.
A semicolon can also be used to show a break in a sentence. A semicolon can show a break that is longer, or more important than a break made by a comma.
The girl had never been so terrified; she backed away, but there was nowhere to hide.
The room is hot; there are neon lights and a lot of people dancing.