I have Ubuntu 14.04 LTS
I have downloaded Telegram from here. The file was compressed with the extension
I have unpacked this file and run the file
Telegram (without extension) using common user (not admin). The application started and worked OK.
But why does Ubuntu not tell me, "Don't run this app, because it is not safe"?
Is it really safe to run such applications, which do not need installation, which run easily when double clicked?
And what are apps like this called? What name do they have? “Portable”?