A score for one hole that is one under par is an, "Eagle".
A birdie is one stroke under par on a given hole.
It means the player shot 4 stokes under par. A par 72 course gives him/her a score of 68 for the round.
Every hole has a par rating - usually 3, 4 or 5. One under means one less than this. So on a par 4 hole a score of 3 is one under par. This is called a birdie.
An albatross is scored in golf when the player completes a hole in a score 3 strokes under par.
Yes the PGA record for lowest score in one round is 13 under or a score of 59.
The score would change by increasing 6 strokes - like from -1 to +5. For instance, if the golf course was par 70, 69 would be one under and 75 would be 5 over par. Remember, in golf the lower the score the better. Making par for 18 holes is very difficult for most golfers. Berney Trembly
A "birdie" is not a specific score, it's one under whatever par for the hole is. If it's a par 3 hole, then a birdie is 2; if it's a par 5 hole, a birdie is 4.
Par for the hole.
Four (4) same as usual one under par
It's used in golf - to indicate a score of 2 shots under par.
Trevor Immelman at 8 under par.