Not all products launch and even those that do, don’t all have the same type of product launches. Products that are continually updated such as web-based software or smartphone apps use marketing techniques to remind customers that their product is available.
Product launches come in different sizes and types:

Soft Launch: When your product sneaks into the market without much fanfare. Often products sold from one business to another launch this way. You don’t get a lot of attention, but maybe your product isn’t quite ready for prime time so it makes more sense for a few customers at a time to have a look.

Minimal Launch: For smaller products or small incremental product changes, the minimal launch gets the word out without a huge amount of marketing spend.

Scale Launch: To let the whole world (OK, your target markets) know about your product, aim for a full-scale launch. You’ll spend a lot of time and energy making this happen. It also has the best chance for success.
Decide which type of product launch is best for your product before you start your product launch plan.