Add a summary

Author: damienbod

aspnetcore/security/authentication/configure-jwt-bearer-authentication.md

@@ -12,6 +12,8 @@ uid: security/authentication/configure-jwt-bearer-authentication
 
 By [Damien Bowden](https://github.com/damienbod)
 
+JWT (JSON Web Token) Bearer Authentication is commonly utilized for APIs. While it operates similarly to cookie authentication, instead of a cookie, the server issues a JWT or tokens upon a successful authentication. A JWT is a self-contained token that encapsulates information for an API resource or a client. The client which requested the JWT can request data from an API resource using the Authorization header and a bearer token.
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 [View or download sample code](https://github.com/dotnet/AspNetCore.Docs/tree/main/aspnetcore/security/authentication/configure-jwt-bearer-authentication/sample/JwtBearer)
 
 This article covers the following areas: