Launch day is the day a product is announced publicly on a launch platform, a community or your own channels. On leaderboard platforms it is also the window in which votes count.
The work happens before it: the page, the screenshots, the tagline, and the list of people you will tell. On the day itself, the job is to reply to every comment and fix what people trip over.
A launch does not have to be one day. Many makers launch several times, on different platforms a week or two apart, each one a little better than the last.
Why it matters for a launch
Treating launch day as the finish line is the common mistake. The visitors fade within a week; the pages, links and feedback you collected are what remain.
Read more: How to launch a product