Actully,the most common breed isn't a breed.Really, the most common type of cat is a non-pedigree,or randomly bred cat. Tabby is the pattern of its fur.
also the most common cat breeds are
but the most common that's not purbred is tabby what the first
The moggy/Domestic Shorthair is the most common breed of cat.
"Tabby" is a certain coat pattern found on cats, it is not a breed. The tabby pattern is the most common and is found in many breeds of cat.