What does pudding mean in british terms?

Pudding is an English Word going back to the fourteenth century and beyond. Originally its meaning can be traced to describe a sausage or sausage-like dish stuffed with all the bits of animals that don't look nice on a plate; black pudding, or white pudding are puddings in the old meaning.

Today it can mean either a sweet pudding (plum pudding, lemon pudding, Christmas pudding, etc) or an unsweetened dish (Yorkshire pudding, steak and kidney pudding, etc).