What is deploy with deb packages?

Question

Software Deployment

As I understand it, a deb package is software packaged in a special package (module), which is loaded and installed by the OC with a command like apt get, etc.
1) are deb packages applicable only for Debian or for other operating systems - Ubuntu, CentOS?
2) what applications can be deployed with deb packages? Pythonic like it is possible to pack in a deb-package, is it possible to apply such a deployment method to PHP?
3) deb-packages are stored in some kind of repo and from there they are pulled to the server? It turns out that you need to roll it out to the peppository, and update it on the server with a separate command?

Answer 1

In essence, a deb package is an archive containing a program, configs, and scripts/instructions for installation into a system.
1. Deb is used on Debian-based systems: Ubuntu, Mint, Kali, etc. CentOS uses RPM (in principle, the same eggs, only in profile)
2. Any.
3. In principle, it is possible without a repository if the package needs to be installed on 1-2 hosts.