In every 2 weeks a new topic about caps is started and everytime it is all explained.
Some research before asking a same question would be nice.....

Edit: OK, because I can be nice....

A simple search and some reding within a minute some topics about caps:

https://www.rctech.net/forum/radio-e...or-enough.html

https://www.rctech.net/forum/radio-e...apacitors.html

https://www.rctech.net/forum/radio-e...capacitor.html