Your vehicle is loaded with electrical devices. Computerized components are everywhere, so good electrical connections are important. Those begin with your vehicle's battery, so it's important that its connections are in top shape.
Ever had a flashlight that didn't work, took out the old batteries to replace them and noticed the old batteries were all corroded? The same thing can happen to your vehicle's battery.
The battery type used in most vehicles is a lead-acid, which can be very corrosive. Corrosion can build up around your battery's terminals that can prevent the electrical connection from being as solid as it needs to be. You may have even seen discoloration around your battery's terminals if you look under the hood, a sign of corrosion.
Or you might notice visible signs of fraying or loose battery cables. All of your vehicle's components are affected by vibrations from the engine and road surface imperfections, and the battery cables take a lot of jostling every time you drive. Frayed cables won't conduct as much electricity as intact ones. Plus, there's the possibility that a frayed cable may touch a piece of metal in the engine compartment that can cause shorts and other problems.
There are some signs to watch out for that might tell you if your battery terminals are corroded or your cables aren't making good contact with them. You might find your vehicle isn't starting as easily as it used to. You also might see the battery warning light illuminated on your dash. That light looks like a rectangle with a "-" and "+" sign inside.
Technicians can make sure your battery and cables are at optimal operating capability with regular service and cleaning. A technician will clean the terminals and portions of the cables that are connected to them. They may also add an anti-corrosion agent to the cables/terminals. Nothing like giving your vehicle a clean start!