Meaning of “protect” - Learner’s Dictionary

protect

verb [ I, T ] us uk /prəˈtekt/
The new law is designed to protect children.Fresh fruit in the diet may protect against cancer.Cats like to protect their territory.The wood is then treated with a special chemical to protect it from the rain.The government is flouting international laws protecting human rights.

B1 to keep someone or something safe from something dangerous or bad:

It's important to protect / your skin from the harmful effects of the sun.
Vitamin C may help protect against cancer.
protection noun [ U ] us uk /prəˈtekʃən/

B2

This coat doesn't provide any protection against the rain.

(Definition of “protect” from the Cambridge Learner’s Dictionary © Cambridge University Press)