There are a lot of reasons why someone might purchase life insurance (here's more info on how exactly life insurance works, in the first place). Some people may consider it if they have children or someone that depends on them financially. They want to help provide financial support for the people who depend on them if they were to pass away.
That said, there are some reasons why single people might want to get life insurance, as well, such as if someone else guaranteed their student debt, they own a home or co-own a business.
There are a few different types of life insurance that you will likely want to know about. Two of the most common types are term and whole life insurance.