updater.exe is a process belonging to an advertising program.
This process monitors your browsing habits and distributes the data back to the author's servers for analysis.
This also prompts advertising popups.
This process is a security risk and should be removed from your system.
Non-system processes like updater.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.
Multiple copies of a process in your task manager may indicate the presence of a virus or Trojan. Make sure you always use an updated antivirus software and perform a full scan to identify any such cases.