"CV" stands for Constant Velocity. It's that constant joint movement that can cause your car to become "arthritic" over time.
The CV joints are located on the ends of your drive shafts/axles and their purpose is to transfer the torque and power of the engine at a constant rate to the wheels. Each CV joint is covered by a sealed plastic or rubber boot, which is intended to keep dirt and moisture out and grease in.
Fortunately, there is little to no maintenance required, unless the protective boot becomes cracked or torn. If this happens, moisture and dirt are allowed in and grease allowed out, the result being lack of lubrication and corrosion that will damage the CV joint. If the damage is found early enough, the joint can be re-packed with grease, and the boot can be replaced. However, if ignored for too long, the CV joint will be damaged, and need replacement.
Prevention is the key here. At each oil change service, your CV boots should be inspected. If any are torn or leaking grease, either the boot and/or the CV joint will need to be replaced. A symptom of a torn CV boot (and the resultant CV joint damage) is clicking or popping upon turning or acceleration.
Check with your ASE certified technician and make sure that inspections of your CV boots and axles are being done on a regular basis. Catching problems early will save you $$ in the long run!
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