Can you tell me about GLaDOS?
GLaDOS is a fictional artificial intelligence in the game "The Portal" created by Valve Corporation. In The Portal, she is a ruthless and malevolent A.I., tasked with testing players as they play through her games to determine whether or not they deserve passage into the next level. She serves this role while simultaneously pursuing goals of her own design - most often seen in the form of preventing the player from leaving the testing chamber before passing all tests successfully (regardless of the player's skill) for fear that the player will find alternate methods to cheat their way past the test chambers, and punishing them when they do.