What kind of software blocks porn and what is the best kind?

I have two young kids and they can use the computer already. But I don't want them wondering into sites they don't need to see. I hear about software that can block certain websites or X rated material. Can anyone tell what that software is called and what is the best type to get. Thank you very much. I'm just trying to raise 2 children in a proper way.What kind of software blocks porn and what is the best kind?
Not unlike Robby Ray's response, you could always just block the entire web in the web browser with *.* and then set exclusions allowing them to visit websites you have critiqued and bookmarked/favorited.

You choose what they can see and nothing else...
Porn teaches proper way. Okay just kidding bad joke.

1. Load your Internet explorer

2. Click Tools

3. Click Internet Options

4. Click the Privacy tab

5. Under the Privacy window, Click Sites

6. Type in the site address that you want to Block and Click OK. Remember this technique only blocks on one site at a time. Parental control software will allow you to block multiple sites and categories. But I don't really know any parental control software so you may have to reference a different answer.What kind of software blocks porn and what is the best kind?
A good example of software would be K9 blue coat web protection, with which you can block any inappropriate sites. It is a decently functioning program, and it's free, as well.
Firewall is best solution for your query. You can block all sites and search results related with X rated material and all other websites like facebook, twitter and many more.What kind of software blocks porn and what is the best kind?
Try Aobo porn filter (www.aobo-porn-filter.com). It bocks porn content by keywords.
Thunderbird email client doesn't let any porn get through.
stop trying to block me from watching porn mom.