What is the diffrence between add_action and add_filter in wordpress? -

what diffrence between add_action , add_filter in wordpress ? when use action hook , filter hook.

you can read here :)

http://ottopress.com/2011/actions-and-filters-are-not-the-same-thing/

add_action => call function

add_filter => "a filter defined function takes in kind of input, modifies it, , returns it."