Raspberry Pi 4 Model B 8GB RAM
The Raspberry Pi is a tiny computer about the size of a deck of cards. It uses what's called a system on a chip, which integrates the CPU and GPU in a single integrated circuit, with the RAM, USB ports, and other components soldered onto the board for an all-in-one package.
It doesn't have onboard storage, but it has an SD card slot you can use to house your operating system and files. The Raspberry Pi is small, doesn't use much power, and is relatively inexpensive.