Class 10 microSD Card With Raspberry Pi OS (Raspbian) - 32GB
Currently shipping on 32GB cards, Compatible with all Raspberry Pi models
Raspberry Pi OS 32-bit pre-installed on a Class 10 microSD Card. Just pop-in and boot up.
Raspberry Pi OS is a free operating system based on Debian, optimised for the Raspberry Pi hardware, and is the recommended operating system for normal use on a Raspberry Pi. The OS comes with over 35,000 packages: pre-compiled software bundled in a nice format for easy installation on your Raspberry Pi.
Raspberry Pi OS is under active development, with an emphasis on improving the stability and performance of as many Debian packages as possible on Raspberry Pi.
Get more information here.