Filters take the results of a selector call and whittle it down some more. There are three types of filter selectors: basic, child, and content. Basic selectors just operate on the jQuery object result set. Child selectors operate on the parent-child relation between elements. And the content filters work on the contents of each of the elements of the result set.
There are 14 basic filter selectors. The first group deals with the position of a result in the result set. Let's deal with them first.
One of the easiest to understand is the