Engadget - Technology News & Expert Reviews
What is a VESA mount and how to know what type your TV has
Those 200 × 200 and 400 × 400 numbers tell you where the mounting holes line up, but you still need to check the mount's weight limit and hardware.
Shown as published in the source's RSS feed. IndiaAIFounders doesn't link out to third-party sites — this is the complete detail available from the feed itself.