This term is often confused with Stop Words. Filter words are common words that search engines remove from web pages before adding them to their databases. These include words along the lines of (the,is,an,of,for,do). As you can imagine, removing these words can save search engines enormous amounts of database space.
 

Frames

An HTML tag construct for making a website appear to have multiple windows within one browser. A frame with links can remain static while clicks cause a different frame to be updated. Most serious websites stay away from frame usage because of browser compatibility problems and search engine problems. Most search engines will not index a framed site..