Tappets? - CJay{P}

When people say a car has 'sticking tappets' - what exactly is the problem? How costly is the potential repair?

If they say that it sounds 'tappety' when cold, and clears up when warm - what is the problem?
Tappets? - piston power
im sure your car has hydraulic tappets, that they are filled with engine oil & when switched off they/some have drained oil off so when you start up the "tappety" noise is the tappet until it fill's with oil then it's quiet.
I have had a few car's that have done this they cleared within seconds so no probs. is your car high mileage? when was the last service? what oil do you use?
Tappets? - CJay{P}
Thanks for the explanation.
So, they are a symptom of wear and tear?
I do not have a FTO with the aforesaid symptoms. It is just that I have seen these descriptives with cars for sale.