The QB opens up to the opposite side and has the option of handing it off to the RB (no 2) who runs it into the 2 gap (hence the name 22). Or, he could keep it and go wider and run it himself or flip it to the WR coming in from the other side. The WR can start in motion to get a bit of a head start. This gives you at least three different options.
This is a very versatile play that you can learn once, and use often. Once it’s installed, you can always call upon the 22 Trap Option and be assured that you will gain yards.