We All know Raspberry Pi OS (formerly Raspbian) is a free operating system based on Debian GNU/Linux and optimised for the Raspberry Pi hardware (the armhf processor architecture).
Raspberry Pi OS comes with over 35,000 packages, or pre-compiled software bundled in a nice format for easy installation on a Raspberry Pi. The initial build was completed in June of 2012, but the distribution continues to be active developed with an emphasis on improving the stability and performance of as many Debian packages as possible. Although Debian produces a distribution for the arm architecture, it is compatible only with versions later than the one used on the Raspberry Pi (ARMv7-A CPUs and higher vs the Raspberry Pi’s ARMv6 CPU).
Well today Raspberry Pi team Released RaspiOS 2021-03-04 Update With Following Changes ;
* Thonny upgraded to version 3.3.5 * SD Card Copier made compatible with NVMe devices; now built against GTK+3 toolkit * Composite video options removed from Raspberry Pi 4 in Raspberry Pi Configuration * Boot order options in raspi-config adjusted for more flexibility * Recommended Software now built against GTK+3 toolkit * Fix for crash in volume plugin when using keyboard could push value out of range * Fix for focus changing between windows in file manager when using keyboard to navigate directory view * Fix for Raspberry Pi 400 keyboard country not being read correctly in startup wizard * Armenian and Japanese translations added to several packages * Automatically load aes-neon-bs on ARM64 to speed up OpenSSL * Raspberry Pi firmware fcf8d2f7639ad8d0330db9c8db9b71bd33eaaa28 * Linux kernel 5.10.17