If Windows came pre-installed:
If you have a key but Windows isn't activated:
A Windows product key is a 25-character code used to activate Windows. It looks like this: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
If you’ve bought a laptop in India, Southeast Asia, or Europe, you’ve likely seen pre-installed. Unlike the standard “Home” edition, this version is locked to one display language. But when it comes to finding or buying a product key, confusion reigns.
Don’t overpay for a “special” Single Language key. Always buy from trusted sources, and if your PC came with it pre-installed, the key is likely embedded in the BIOS – you never need to type it manually.
Technically, no. The interface is locked. The only way to change the language is to perform an "in-place upgrade" to the standard Windows 10 Home edition (using a generic key to switch editions) or perform a clean install of a different Windows version.