Meaning of the word "in case" in English

What does "in case" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

in case

US /ɪn keɪs/
UK /ɪn keɪs/

Conjunction

because of the possibility of something happening

Example:
Take an umbrella in case it rains.
I wrote down her number in case I forgot it.