TekByBob.com is an existing web site that offers a regular set of technology tips for users who are looking for useful tips on how to use technology better. As part of the TekByBob.com regular series of articles, Bob Gravley (the TekByBob.com author) often writes articles for Tek4Free.com. Tek4Free.com focuses on letting people know about easy and useful technology solutions that are free.
Webs.com is a provider of free web hosting services (free through ad supported services) and in the course of writing an article for Tek4Free.com about Webs.com services, TekByBob.com was used as an example to show how easy and useful the Webs.com services are to use.
So to make a long explanation longer, TekByBob.webs.com is the byproduct of an article on Tek4Free.com (article is hot linked for your enjoyment.)