Meaning of the word "when necessary" in English

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

when necessary

US /wɛn ˈnɛsəˌsɛri/
UK /wɛn ˈnɛsəsəri/

Phrase

if or when it is needed; as required

Example:
We will provide additional support when necessary.
Adjust the settings when necessary to optimize performance.