bho.dll is a module belonging to an advertising program by BHO.
This module 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 bho.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues