Could you help me to identify my cats breed Its a black longhair cat?

There are several breeds of black longhair cats, including:

Bombay: Bombay is known for its unique black coat and copper eyes. They're known for their affectionate and social personalities.

Maine Coon: Is a larger breed with a robust body and a thick, bushy tail. In addition to its long black fur, Maine Coons also have a distinctive ruff of fur on its chest.

Persian: Has long, silky fur that comes in a wide range of coat colours and patterns. Persians are popular for their docile, gentle, and affectionate nature.

Siberian: Originated in Russia and has evolved to survive harsh climates. Siberians have a dense, water-resistant double-coat that can come in a variety of colours, including a distinctive dark tabby pattern called the Neva Masquerade pattern.

Oriental long-hair: It has a long and narrow face, a pointed muzzle, and a tubular body with long legs. Its fur is semi-long and comes in various colors and patterns, including black.

To be certain, you can also consult a veterinarian or a cat breeder who specializes in long-haired cat breeds.