Deploy = is the process of making software available on a target environment. This could be a production environment, but it also might not be.

Release = is still a technical activity, but it’s where you make the newly deployed changes available to your users.

Launch = is a strategic activity (non-technial) where you inform the market about specific features and changes.

I love product newsletters! I really got to see what good looks like several years ago while working at a globally distributed company. We had offices and product teams all around the world. Every month, we would send out an internal newsletter to the whole organization, giving an update on what each product team was working on.