"CSS is an acronym for Cascading Style Sheets" mean?

Question

i am learning css and can not get the meaning of this line

Answer 1

Find the meaning of 'acronym' in Google or in dictionary...

Cascading Style Sheets : called as or short form is CSS..
CSS Is a way of applying styles to Web documents....

Answer 2

Cascade => arrangements
Css = A sheet used to describe arrangements of different elements