Azure VM generation 1 vs generation 2

What is the difference between generation 1 and generation 2 VM's

generation 1 and generation 2 VM are now available in azure, you need to consider the generation of VM before it gets deployed, once VM is created you can't change a virtual machine's generation.
The main difference between azure VM gen1 and gen2 is boot architecture Generation 1 VM use BIOS-based architecture whereas Generation 2 VMs use the new UEFI-based boot architecture
we can extend/create OS disk up to 2TB in generation 1 VM's but disk can be extended/created beyond 2TB when we use generation 2
There is no cost difference between Gen1 and Gen2 VM's

Happy learning