Wagyu beef is distinctive because it is highly marbled. Marbling refers to the visible layers of intramuscular fat. This is fat that is found in the muscle. Due to the unique genetics of the cows, the meat contains a higher percentage of fatty acids than ordinary beef, giving it a higher marbling score.
Wagyu beef is raised in a highly specialized way. Wagyu cows have genetic traits that feature a high degree of marbling. It it is in their genes and there is also much work that goes into cultivating them to the point where a Wagyu Steak can sell for hundreds or even thousands of dollars!
Now you know why Wagyu steak is so special.