The greatest points of interest in external style sheets are that they can be connected to different records while being overseen from a single style sheet. This keeps code DRY and improves productivity and comfort. The weaknesses are that it might decrease the loading time in some situations.
Advantages
1) The style of a few documents can be controlled from the site by utilizing them.
2) Multiple HTML elements can have numerous documents, where classes can be made.
3) To assemble styles in complex circumstances, selector and grouping strategies are utilized.
Disadvantages
1) The additional download is expected to import documents having style information.
2) To render the documents, the outer template ought to be stacked.
3) Not practical for small style definitions.