Advice or advise?

Advice /ədˈvaɪs/ is a noun and means a suggestion about what someone should do. It is uncountable:

• Let me give you some advice: stay away from Margaret.

• Not: Let me give you an advice

• She gave him a lot of advice, but I don’t think he listened.

• Not: …a lot of advices …

If we want to use advice in a countable way, then we use the phrase a piece of advice:

• I have two pieces of advice for you about the holiday.

We use the verb advise /ədˈvaɪz/ to mean ‘to give someone advice’:

• I strongly advise you to lose weight.
• They finally did what we advised.