what is meant by red meat?

red meat refers to tthe type of meat
pig cow are red meat
no if you cook it longer it is still red meat

lean meat
are meats such as chicken

when talking about red meat concerning diet, red meat generally refers to beef but may include most mammal meats except pork. Not a question of how much you cook it. Poultry and fish are white meat (I imagine reptiles are too).

Red meat refers to the color of the meat before it is cooked. It includes beef, sausage, even pepperoni.

White meats are things like chicken and pork

beef mostly,lamb is more fatty.

In the context you are talking it can be both, but generally it is beef and lamb, and some others.

When cooking it is the degree of rareness we use rather than colour

That's because cells(the life)have been killed by cooking it in a hot boiling water

red meat mostly refers cow meat.

Red meat is like beef, duck, pork.

It is still red meat although you cook it.