This is a quick video by Matt Cutts from Google giving you a quick explanation of how search engines work. He also provides you with some search engine optimization techniques you can use right away that will help your blog get more traffic.
It's a good video for a new blogger that is just starting out and trying to learn how search engines work. When I started out SEO seemed like a foreign language and I thought I'd never grasp it, but it's not really as hard to understand as it first appears.
If you already know how search engines work and understand the basics then don't waste your time watching this video. But if you're a new blogger and have some questions then I'd recommend watching this quick video.
Here's a link to Google's Search Engine Optimization Starter Guide that's another great resource to learn from.