What is the main difference between selectors and filters?
Filters are used to remove content from the page. Selectors are used to add content to the page
There is no real difference. They are both used to build up lists of page content.
Selectors are used to find and select content in a page. Filters are used to refine the results of selectors.
Selectors are used to refine the content that filters have been applied to.