The diff between openssl-2 and openssl-3

New to this.

How can you tell what the openssl version is and what's the diff?

From stackoverflow $pageUsers[$entry.posts[0].author].name

• Find the current OpenSSL version on the OpenSSL webpage (0.9.8k as of 25-Mar-2009 and 1.0.0, third beta as of 15-Jul-2009). OpenSSL is a implementation of the TLS cryptographic protocol suite (amongst other things).

  From David Schmitt