Networking really isn't what you probably think it is. It's not going to weird conventions and handing out your business card (if you even have one). Networking isn't about that. It's all about being someone valuable to your community, someone who helps out, someone who is present. Real networking happens naturally. That being said, what are some things you can do to jump-start the process, I'm pretending you asked? Glad you did, I fake answer.
#1. Be Open and Available
The biggest and most important part of networking is being open and available. Get active in your community and volunteer for things. Introduce yourself to people at events. Talk to strangers - I know your mom told you not to, but you're an adult now. And besides, talking to strangers is the only way to make friends.
#2. Have an Online Presence
Keep in mind that, as you get older, your Facebook page really reflects your maturity. Keep it to things that you wouldn't mind future employers looking at. Because they will.
Also, you're going to want to make a LinkedIn profile and get started on that. I know it's a bit early and you don't really need it yet, but that's the idea behind networking. You build a network and help other people out. Then, when you need help, you've got folks there for you.
#3. Have an Offline Presence
Basically, you want to be someone who is both memorable and referable. If you're anything like most students, once people find out you're in college they start grilling you with questions about your school, your major, your dorm... everything. They want to know about what you do.
So tell them. You know what they're going to ask, so prepare an answer. This is called an "elevator pitch." Basically, craft a 30-second explanation of what you do and why. That way, you're not hemming and hawing while you try to explain your life's passion. Doesn't look good.
There's lots more to networking than just this, of course. For a little more information to help get you started, head on over to this post.