Just want to know

[weegillis]

Guest blogging is basically when you are a good enough blogger (that is, you have your own quality blog), that some other online blog invites you to make a post on their website. It helps them get some more good quality content on their website by having a qualified person post, and it helps you by getting you some more exposure.

Operative word being, 'invite.'

[jasonwdexter]

Guest blogging can be a great way of getting a valuable backlink to your website. Write something that is informative, useful, humorous or is generally not spammy. Chuck in a link to your website, and you've got a page that is relevant to your website, good anchor text, great marketing and the opportunity for a regular guest spot.

[LloydBurrell]

Guest blogging can be a great way of getting a valuable backlink to your website. Write something that is informative, useful, humorous or is generally not spammy. Chuck in a link to your website, and you've got a page that is relevant to your website, good anchor text, great marketing and the opportunity for a regular guest spot.

... And negotiate between being relevant to your host and to your own website. This is not as easy as it seems at a first glance, but it's doable and I've come across many bloggers who understand very well the value of context.