An app installs a complete area of work — its own space, sheets, fields and views, already fitted together. Bigger than a template, and it keeps working as a unit.
Open the launchpad and choose an app. Installing creates everything it needs. It appears as a tile you can return to.
Others appear on the launchpad as they ship.
An installed app is not a black box. It is spaces, sheets, fields and views — exactly what you would build by hand. So you can adapt it: add a field, change a view, build an automation on top. Nothing is hidden or locked.
That is worth knowing before you decide it almost fits.
Apps get new versions. Opening a tile after an update may run a short setup step to add what the new version needs. If a tile seems to pause the first time you open it after a release, that is what is happening.
An app installs into a space, so who can see it follows that space's membership. Installing the Support app does not show every colleague your tickets — add the people who should handle them.
Related: Install a template · Spaces, folders and sheets