Twitter APIs handle enormous amounts of data. The way we ensure this data is secured for developers and users alike is through authentication. There are a few methods for authentication, each listed below.
Most developers will not need to deal with the complexities surrounding authentication since client libraries automatically handle these difficulties.
You can find a list of available client libraries on our tools and libraries pages >
If you would like to make requests on behalf of another user, you will need to generate a separate set of Access Tokens for that user using the 3-legged OAuth flow, and pass that user's tokens with your OAuth 1.0a User Context or OAuth 2.0 user context requests.