Meera asks her friends for "advices". Her brother says "advice" does not have a plural form…

Why

Meera is reasoning exactly the way a countable noun works — if you can have one book and two books, it feels natural to expect one advice and two advices. "Advice" belongs to a different family of nouns, though, called uncountable (or mass) nouns, which describe things thought of as a whole substance or idea rather than separate countable units — like "information", "furniture", or "water". You don't count these directly; you can't have "three furnitures", only "three pieces of furniture" or "a lot of furniture". "Advice" works the same way: you can have "some advice", "a lot of advice", or "a piece of advice", but never "advices". Test: try the same trick with "water" — "I drank two waters" sounds off in the same way "advices" does, because water is uncountable too, thought of as a substance rather than separate items. Her brother is right: "advice" is uncountable and has no plural form — you'd say "some advice" or "a piece of advice" instead.