ID and class in CSS?

[sereYboth]

Hello everyone!
what is different bettween ID(#name) and class(.name) in CSS?
but i think it is the same!

Pleae tell me!
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[siji44]

ID can be used only once in a page but class can be repeated any number of times.

[drumichael87]

You would use ID for something that will be used only once per page, like wrapper , header or footer .

Class can be used as many times as you desire, and would be used for something like post_title , post_content or post_metadata .

(blogishly speaking)

[macneato]

Both answers are completely correct. Rule of thumb though, IDs are unique, classes aren't, hence only using them once in a page.

[sereYboth]

Thank everyone I see!