which is the latest processor for computer?

There are several. Depends on what kind of computer. How much USD do you want to spend?
Desktop: Intel® Core™ i7-5960X Processor Extreme Edition BOX : $1059.00
Server: Intel® Xeon® Processor E7-8891 v2 (37.5M Cache, 3.20 GHz) TRAY: $6841.00
Mobile: Intel® Core™ i7-4940MX Processor Extreme Edition (8M Cache, up to 4.00 GHz) ~$1096

There are also 64bit ARM chips (lower power - not so commonly found), as well as Intel-compatible AMD chips similar in capability to those that SteveDotNet mentioned. ARM chips are commonly used in cell phones and tablets. They are just getting into use for servers.

@rubysethi

Do your own bloody homework
2 threads
2 ridiculous broad questions, that google has answers to

depart post haste and return thou not, til thou has wit enough that were wit dynamite, thou couldst blow thine hat from atop thine head