-What are referrers;
-Types of referral scripts.
Simply put, referrers are websites that send you visitors. Be it google, a link trade, or some random website that has linked to you.
Some websites have what is called a toplist. This is a script that keeps track of how many people each website sends them, and lists these sites in order from the one who sends the most traffic to the one who sends the least (or it may only show the top 10). These are a good source of quick traffic, so do a few trades with these type of sites. The only problem is that your link on their site is not a hardlink, so it wont affect your page rank. For Blogger, a good toplist script is Xclicks. It can be tedious to set up, so follow the guide on the site.

Remember, if you find a site that looks like it could be a good source of traffic and it has a script running like e-referrer, send some hits to them to get listed on their referrer list to get some traffic back.
The code for e-Referrer can be easily installed using the following steps:
- Log in to your Blogger account.
- On the first "New Post" click "Layout".
- Click "Add a Page Element".
- Choose the "HTML/JavaScript" then click, "Add To Blog".
- Paste the e-Referrer code into the space provided. (ctrl v)
- Click "Save Changes".
There are other scripts available out there that can be used for blogger. If you come across a site that has a decent looking script, try to find a link for it on the site.