AppleCare is Apple’s term for its warranty plans. Every Apple device comes with a certain AppleCare warranty and free phone / chat support, typically one year for warranty and 90 days of phone support. You can pay to extend that warranty longer, called AppleCare +.
Because Apple makes the hardware, the operating system and many applications, real products
Apple products are truly integrated systems.
And only AppleCare products provide you with one-stop service and support from Apple experts, so most problems can be resolved in one call.