Here are two Nike drivers.  These are the largest clubs in the bag.  They are usually used when teeing off, or used when you are in the fairway.  They drive the ball the furthest out of all the clubs.

Here is a picture of a putter.  Putters are used only when you are on the green and are putting the ball into the hole.
These are pictures of golf irons.  In a complete set there are seven irons not including the wedges.  Each iron has a different grade to causing the ball to go higher or farther.

The last of the clubs are the wedges. There are also different grades on wedges, but they usually fly higher rather than father.  pictured to the right is a sand wedge which is used when the ball has lied the sand trap.

Links:

Golfing   Equipment   Golf Courses   Professionals