Is Windows 11 Free?

Windows 11 is a free upgrade that anyone with active license of Windows 7 or higher can get as long as you meet minimum system requirements.
You may also get the free ISO from Microsoft website to try it out even without activating it.

Processor - 1 gigahertz (GHz) or faster with 2 or more cores on a compatible 64-bit processor or System on a Chip (SoC)
Memory - 4 GB RAM
Storage - 64 GB or larger storage device
System firmware - UEFI, Secure Boot capable
TPM - Trusted Platform Module (TPM) version 2.0
Graphics card  - DirectX 12 compatible graphics / WDDM 2.x
Display - >9” with HD Resolution (720p)
Internet connection - Microsoft account and internet connectivity required for setup for Windows 11 Home