The term "bearer" has several meanings, depending on its context.
1) In a general sense, a bearer can refer to anyone who carries or holds something, such as a physical object, responsibility, or title. For example, someone could be referred to as the bearer of bad news, meaning they are carrying that information and delivering it to others.
2) In finance, a bearer is an instrument (usually a bond or stock certificate) that does not have a specific owner's name on it, but rather has "bearer" written on the document instead of a person's name. This means whoever physically holds the paper is considered the rightful owner.
3) In some countries, bearer also refers to someone who holds a driver's license or other form of identification that does not have their photo on it. Instead, the word "bearer" appears where the person's name would be.