What is elder care?

Are you asking if it is an organization or how we care for an elder?
I'm in central Mass. and there is a local non-profit that helps elderly people and their families in need. You have to contact them and someone comes to the home to evaluate the person in need. They will assess health and will want to know some financial things. Then if they deem the person to be eligible for aid, they will set you up for home visits, someone to clean the house, or someone to come in to bathe you once a week, or they will pay for daycare costs according to financials. My mom is in daycare four days a week and has an $83 copay/month. The rest of the cost (and it is substantial), is paid by the eldercare company. They also supply vouchers for respite care and other things.
Hope this answers your question. If there is something like that in your community, your local senior center should have that information for you.

Thank you for responding. My sister is recovering from a major stroke, and needs to be rehabilitated to be able to speak and walk again, she is only 58 years young, and I am not sure if she qualifies for senior services.

I don't see why not! A lot of these services also cover people with disabilities, etc. I'm sure she would be welcome at a senior center, so why not contact them and see what they say. They can be the best source for finding help. Also, she should be guided by someone at the hospital to the type services she will need and how to get them. I believe a social worker will be assigned to her case as she will most likely need home visits once she is released from the rehab facility.The next time you visit her, talk to hospital personnel and have them set up a family conference so that you can all know what to expect. The hospital will be your best resource for information at this point. They will even make arrangements for you to speak with all the principals that will be involved in your sister's recovery.
I wish you both good luck and a speedy recovery for your sister!