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A real shell

Your own shell on a real pseudo-terminal: forkpty on macOS and Linux, ConPTY on Windows. Started as a login shell, so PATH is what it is everywhere else.

Termina does not imitate a shell. Each tab starts your shell on a pseudo-terminal, through JetBrains’ pty4j, and moves bytes between it and the screen.

• Real PTYs on every platform. forkpty on macOS and Linux, Windows’ ConPTY on Windows. One library carries every platform’s native code, so nothing is built per OS.
• A login shell. An application started from the dock or a menu inherits a stripped PATH, with no Homebrew and no version-manager directories. The shell is started with -l, so your profile puts them back.
• A UTF-8 locale when you have none. If none of LC_ALL, LC_CTYPE or LANG is set, the shell gets LANG=C.UTF-8, which exists on minimal systems where en_US.UTF-8 often does not. Any of the three set by you is left alone.
• It says what it is. TERM=xterm-256color, COLORTERM=truecolor and TERM_PROGRAM=Termina.
• One shell per tab, never shared. Closing a tab ends its shell and everything in it, and a shell that exits closes its own tab.

Which shell a tab runs is a profile.