Her real name was Anjez毛 Gonxhe Bojaxhiu. As a child, she lived in a city called Skopje (which is now in North Macedonia), but her parents were Albanian and she spoke Albanian at home. She left when she was 18 to train as a teacher, and ended up living in India for most of her life.
She is most famous for the work she did in the city of Kolkata, in India. She walked the streets looking for people who needed help - children with no parents, people who were sick or hungry - and tried to make sure that each one had a kind face nearby and a meal that day. She set up homes where they could live and be cared for.
She became famous because she kept going for decades. Then other people, all over the world, started joining her to do the same kind of work in their own cities. By the time she died in 1997, her helpers were working in over 100 countries.
Today Albania remembers her with a national holiday called Mother Teresa Day on 19 October. There are statues of her in Tirana, Shkod毛r and many other towns. Children in Albanian schools learn her name early - she's a reminder that one small person, doing small kind things every day, can change a lot of lives.