Frames are the bane of the Web, and should be avoided whenever possible . This site explains why and how to avoid frames, and suggests alternatives. Sites containing it are taking their visitors' needs into account by excluding frames.
Some Web browsers have the ability to split a window into multiple panes.
These panes are called 'frames'. Frames allow a single browser window to display multiple URL's at the same time. Some Web browsers don't support frames. For this reason, if you do decide to use frames, you should at least provide an additional non- frames version of your Web site. Thus, documents inside frames are not properly bookmarkable, and search engines cannot properly index them.