The following examples show a semicolon used to separate two sentences that are related but grammatically independent:
Richard likes cake; Susan likes salad.
Bill was going bald; his hair was falling out.
I didn’t see the step; I’ve now got a bandage on my head.
The semicolon can be used like a comma in lists of items, especially when the list is complicated:
She planned to visit five locations: Soho, London; Brighton & Hove; New York, Mumbai and Hong Kong.
To play the piano well you need: a strong pair of hands; the ability to read music; and a certain passion to perform.
Learn more about using the semicolon.