Summarise from the given text, Why do people like pets?

Pets provide their owners, or guardians, both physical and emotional benefits. Walking a dog can provide both the human and the dog with exercise, fresh air, and social interaction. Pets can give companionship to people who are living alone or elderly adults who do not have adequate social interaction with other people. There is a medically approved class of therapy animals that are brought to visit confined humans, such as children in hospitals or elders in nursing homes. Pet therapy utilizes trained animals and handlers to achieve specific physical, social, cognitive, or emotional goals with patients.

1. Pets benefit their owners/guardians both physically and emotionally.
2. Talking a dog for a stroll helps both human and dog through physical exercise, inhaling fresh air and social interaction.
3. For people who live alone, aged people in nursery homes, children in hospitals etc who don't interact with other people, There is a class of medically approved therapy animals that are brought to visit to gain specific type of physical, social, cognitive, or emotional benefits