Questions about surge protectors can be asked as long as it related to use with your computer or peripherals and when attempting to determine the proper level of protection required for your equipment. Purchasing recommendations are strictly off topic.
A surge protector (or surge suppressor) is an appliance or device designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or shorting to ground any unwanted voltages above a safe threshold. 
These devices can also include protection for cable, telephone and Ethernet connections.