This is grass made in Blender 3.1.2.
It was made with hair particles, with the emitter being a 8.98 x 8.98m plane. The material used is procedural and made to look photorealistic.
The mesh consists only of one polygon and four vertices. Only file available is a .blend one because when converted to other types, problems arise.
Can be used in Eevee as well, but from a further distance as it does not look as realistic.