Golf Term - What's a Birdie?

For the concerned, well, it's not some name calling.

A birdie refers to a situation when a golfer scores one shot below a hole's par.

For example:

Al is at the Par 4 hole number 6. He reaches the green in 2 (which means he reached the green in 2 shots). He then holes it with his third shot. Thus, he has shot one score below the average 4 shots for the hole - he has made a birdie.

Similarly, if Al holes in 2 shots at the Par 3, or, make 4 shots at the Par 5, in both instances he also made birdie.