Keywords are used to limit the number of results you get from a category. For example, if the category is Animals, you might enter dog as a keyword to show listings that only pertain to dogs. You could also enter dog, cat to get listings that pertained to both dogs and cats.

Keywords are used in an "and" search. In other words, only listings that contain all of the keywords are shown. What this means is that the more keywords you use, the fewer listings you will have displayed.

Note that commas are required between keywords. Words that do not have a comma between them are searched for as a phrase. For example, german shepherd would yield only those listings that had the phrase "german shepherd" in them. Entering german, shepherd on the other hand would show listings that contained "german" and "shepherd" in any order.

You can enter only the first portion of a word to retrieve listings using a partial match. For example, if you entered bio as your keyword, you would see all listings for biomedical, biomaterials, biorythm, etc.