You play your iron off the fairway, the contact is clean, the ball goes where you wanted it. A piece of turf goes with it and lands two metres in front of you. You look at the brown scar and wonder whether you have done something wrong.
No. A divot, in golf, is the piece of turf and soil the clubhead takes at impact. On an iron shot it is normal. Depending on what the course asks for, you replace the piece or fill the hollow with the mix provided: the essential thing is to repair it straight away.
A divot is the turf the club takes with the ball
The word means two things, which is where the confusion comes from: the piece that lifts, and the hole it leaves. Replacing a divot means putting the piece back. Repairing the damage can also mean filling.
On a descending iron strike, the club meets the ball and then the ground: the divot comes off in front of where the ball was sitting. With a driver, the ball is up on its tee and you are not trying to take turf. With an iron on a par 3, a divot can come off just as it does on the fairway.
An intact piece that carries soil and roots with it can take again. Put back quickly and pressed down, it regains contact with the ground. Its chances also depend on the grass and the conditions: drought makes recovery harder. Left beside the hole, it dries out, and the scar stays open far longer.
The action: replace, press, move on
If the course asks you to replace divots, go and pick yours up in front of you. Put it back in its hole, grass up, tucked against the edges, then press with your foot to bring the surface level. Not a stamp of the heel: a firm, flat pressure that puts the roots back in contact with the soil. And a wipe of the towel across the grooves before you move on.
What matters is the moment. Straight away, before you walk towards your ball. The divot you promise yourself you will fix later is easy to forget: you look at where the ball finished, you put the club away, and off you go. We prefer to make it the last step of the shot, before thinking about the next one.
If the piece crumbles or has lost its soil, the mix provided can fill the hollow. Bring it level, without a mound. The USGA recommends following the course’s own guidance: depending on the grass and the state of the divot, repair is not always the same.
Then there is the case where your ball finishes in a divot hole nobody has closed. That hole does not, in itself, entitle you to free relief: you play the ball as it lies. On the fairway, declaring it unplayable is an option, with a penalty stroke. Another condition or a local rule can change the case. And you cannot fill the hole to improve your shot.
Divot and pitch mark: two things people mix up constantly
Two different kinds of damage, caused by two different objects, in two different places.
The divot is made by the club, anywhere the ball is sitting in grass: fairway, rough, the tee of a par 3. Material has been torn out: you replace the piece or fill the hollow according to the guidance.
The pitch mark is made by the ball coming down from height onto the green and sinking into it. Nothing is torn out: it is an indentation, and it is lifted with a repair tool.
On the fairway you repair the divot, on the green you lift the pitch mark. The green has its own objects, the repair tool and the ball marker, which live in the same pocket as everything else you carry.

What the next group finds
Once you get into the habit of repairing your own, you notice the ones other people leave open. Nobody follows each player around to remind them. That is precisely the problem.
Golf has no supervisor. What keeps a course standing comes down to a handful of actions nobody checks.
A divot is a few seconds of repair, according to what the course asks. And it is the trace the next group will keep of your passing through.
