Watch the Basic Bending online guitar lesson by Chris Buono from 60 Electric Guitar Techniques You MUST Know
Playing a note and changing the pitch of that note by moving the string towards the ceiling or the floor is what a bend is. What it's all about is expression. Right up there with vibrato, bending is one the most expressive of all electric guitar techniques.
Looking for inspiration? Listen to music with electric guitar players. I promise our brethren will provide more than enough examples of the power of bending.