What are selectors in CSS?
 

Selectors help to select an element to which you want to apply a style. For example below is a simple style called as ‘intro” which applies red color to background of a HTML element.
Collapse | Copy Code



To apply the above “intro” style to div we can use the “class” selector as shown in the below figure.
Collapse | Copy Code

They are following:
1. Id selector
2. Class selector
3. Element selector
4. Grouping Selector.

selectors in CSS are as follows:
1. Universal selector
2. Type selectors
3. Descendant selectors
4. Child selectors
5. Adjacent sibling selectors
6. Attribute selectors
7. ID selectors

Thanks for Sharing...

For reference w3schools is the best place