If you care about something, you feel that it is important and are concerned about it.

If you care for someone, you feel a lot of affection for them.

If you care for someone or something, you look after them and keep them in a good state or condition.

Children who are in care are looked after by the state because their parents are dead or unable to look after them properly.

If you say that you do not care for something or someone, you mean that you do not like them.

If you say that someone does something when they care to do it, you mean that they do it, although they should do it more willingly or more often.

You can ask someone if they would care for something or if they would care to do something as a polite way of asking if they would like to have or do something.

If you do something with care, you give careful attention to it because you do not want to make any mistakes or cause any damage.

Your cares are your worries, anxieties, or fears.

You can use for all I care to emphasize that it does not matter at all to you what someone does.

If you say that you couldn't care less about someone or something, you are emphasizing that you are not interested in them or worried about them. In American English, you can also say that you could care less, with the same meaning.

If someone sends you a letter or parcel care of a particular person or place, they send it to that person or place, and it is then passed on to you. In American English, you can also say in care of .

If you take care of someone or something, you look after them and prevent them from being harmed or damaged.

You can say 'Take care' when saying goodbye to someone.

If you take care to do something, you make sure that you do it.

To take care of a problem, task, or situation means to deal with it.

You can say 'Who cares?' to emphasize that something does not matter to you at all.