Vivaldi installation folders

[newscpq]

Hi all, I just switched to Linux, from W10 and I'm trying to understand how an installation of an app works, in Ubuntu: Vivaldi's executables are in the /opt/vivaldi-snapshot/ folder, but the command line is in the /usr/bin/ path.
I'm new to Debian and to Linux: can someone help me understand why the files are placed into the /opt/folder, instead of the /usr/bin one?
Sorry, for the silly question...
Newscpq

[lamarca]

Hello there,

/usr/bin/vivaldi-snapshot is a symlink.
The output of the cmd [[ $ ls -lha ]]

lrwxrwxrwx 1 root root 38 Jun 14 09:31 /usr/bin/vivaldi-snapshot -> /opt/vivaldi-snapshot/vivaldi-snapshot

[lamarca]

@Gwen-Dragon Really! I would never imagine /opt is dedicated to some some for proprietary software ;p

Edited: grammar