The darling semi-colon is sadly going out of fashion, but I do love a semi-colon when used in the right place. It is often misused, however; some writers aren’t quite sure what to do with it and some have a prejudice against it and shy away.
The sweetie semi is heavier than a comma, but less heavy than a full stop. It is handy for separating two sentences that could stand independently with a full stop between them, but are somewhat closely connected in sense. And when you have long lists of items, I like to use a semi-colon to separate them to make it easier for the reader to absorb the information.