What does a 64 on a AMD processor mean?

A "64" in an AMD processor designation typically indicates that the processor is based on a 64-bit architecture, which allows it to handle more memory and perform better with certain applications compared to 32-bit processors. This architecture enables the CPU to process larger data sets and run more efficiently in 64-bit operating systems. It is commonly associated with AMD's Athlon 64 and Opteron series, which were among the first to support 64-bit computing.