Blue
A variant of Indian ringneck parakeet (Psittacula krameri)

Representative Indian ringneck parakeetphoto — a dedicated image of this exact morph isn't available yet.
A recessive mutation that removes yellow psittacin, turning the green body a cool powder/sky blue with a white-and-grey neck ring. One of the most popular and widely bred ringneck colors.
Keeper tips for this variant
Care is identical to the wild-type — the blue is purely cosmetic with no linked health issue; just buy from a breeder who outcrosses to avoid the inbreeding that plagues popular mutation lines.