When to generate client secret for an OAuth app?

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4 - Data Explorer
4 - Data Explorer

The client secret is described as:

An optional private key that authenticates your integration when requesting an OAuth token.
You should only generate a client secret if you are requesting OAuth tokens from a server. Do not generate a client secret if you have a desktop, mobile, or web application directly issuing the OAuth token request.

Can anyone clarify why there is a difference between requesting a token from a server and from an application? Isn't using a client_secret generally more secure?

If I am creating an OAuth app that will be used by others to authenticate from different machines and possibly servers, should I add a client_secret or not?

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My guess is that they wrote it that due to different OAuth 2.0 grant types:

For the Auth Code grant types, you definitely need a client secret imo: