What Does Twitter’s s Parameter Mean?

When I use the share button on Twitter the link becomes https://twitter.com/username/status/ID?s=number instead of https://twitter.com/username/status/ID. What is the meaning of this ‘s’ parameter? Is it an ID that gets generated to see who uses the link you shared? I’m assuming the ‘s’ stands for share ID or <joke>spy on you</joke>. The link works the same without the ‘s’ parameter.

Am I right about this or is it something else?