A security token with the property that any party in possession of the token (a "bearer") can use the token in any way that any other party in possession of it can. Using a bearer token does not require a bearer to prove possession of cryptographic key material (proof-of-possession).

Why do we use bearer?

The most common way of accessing OAuth 2.0 APIs is using a “Bearer Token”. This is a single string which acts as the authentication of the API request, sent in an HTTP “Authorization” header. ... Bearer tokens are a much simpler way of making API requests, since they don't require cryptographic signing of each request.

What is bearer authorization?

Bearer authentication (also called token authentication) is an HTTP authentication scheme that involves security tokens called bearer tokens. The name “Bearer authentication” can be understood as “give access to the bearer of this token.” ... Authorization: Bearer <token>