Answer
The 'command' option in Tkinter is used to specify a function or method that should be called when a widget, such as a button, is activated (i.e., clicked).
Work Step by Step
For example, when a user clicks a button, you can specify that a specific function should be called, and this function will perform some action or computation. By assigning a function or method to the command option, you can bind an action to a widget and specify the behaviour of your GUI when the widget is activated.
Here's an example of how you might use the command option in a Tkinter button widget:
from tkinter import *
def my_function():
$\hspace{4mm}$print("Button was clicked!")
root = Tk()
button = Button(root, text="Click me!", command=my_function)
button.pack()
root.mainloop()
