What is "64-bits"

Modern 64-bit processors are capable of 64-bit processing at a time, significantly improving their performance. The most commonly used processors on computers are 32 bits. Older processors operated the 4-bit Intel (4004 and 4040), 8-bit Intel (8008, 8080 and 8085), Zilog Z-80, 16-bit (Intel 8086, 8088, 80186, 80188 and 80286) and 32-bit Intel (80386 and 80486). Pentium processors have 64 bits of data bus, but the main internal records have remained in 32 bits. Another example is the Gpus (Graphics Processing Unit), better known as Graphics Cards; the most current cards range from 64 to 512 bits, where the difference in performance is clear. A 600 Mhz and 64-bit graphics card, for example, will have a significantly lower performance than the 600 Mhz 256-bit video card, although both have the same processing speed, since the 256-bit video card will process more information at a time. One might even say that one is 4 times better than the other in terms of processing quality