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Continuous HRT is where you take the same dose of both oestrogen and progesterone every day. It is used when your periods have stopped or when you have used cyclical HRT for more than 1 year. The aim of continuous HRT is to prevent bleeding.
Cyclical HRT is where you take breaks from the progesterone part of HRT, usually each month. You will usually have a withdrawal bleed around the time the progesterone has stopped. Some methods of HRT have this break built in already.

If you have a uterus and are using oestrogen HRT then you will need to take a form of progesterone to protect the womb lining (endometrium) from overgrowing as this can increase the risk of endometrial cancer. This progesterone is called endometrial protection.