Tkinter

Tkinter is Python's standard, built-in library for creating cross-platform graphical user interfaces (GUIs).

Tkinter acts as the official Python interface (or 'Tk interface') to the Tcl/Tk GUI toolkit. It comes bundled with most standard Python installations (Windows, macOS, Unix), eliminating external dependencies and ensuring immediate availability for developers. This module allows for rapid desktop application development using a core set of widgets: for example, the `Button`, `Label`, and `Entry` widgets. It supports geometry managers like `.pack()`, `.grid()`, and `.place()` for precise layout control, making it a reliable, lightweight choice for simple to moderately complex GUI applications.

https://docs.python.org/3/library/tkinter.html