What does the !important means in css

Question

Example
. home{
margin:30px!important ;
}

Answer 1

It means any other same style used for that class won't get applied (i.e any other margin style applied to the class="home" won't be effective)

Answer 2

Once set to important, the styles will not get overridden..

Answer 3

important property in CSS is used to provide importance than normal property. ignore all the subsequent rules, and apply ! important rule