Pre-rendered cinematic cutscenes are essentially high-quality movies embedded within the game files.
Be prepared for the actual download sizes. The classic 2009 version requires roughly 12 GB of free space, while the massive 2022 reboot can easily demand over 100 GB depending on the game modes you choose to install.
: In rare cases, it might be an endlessly looping extractor that fills your hard drive with dummy "zero-byte" data to look like it is installing a game, only to crash at 99%. The Safe and Legitimate Ways to Play MW2