Drain Lines (A/C Unit)

The pipe down low is the primary or main condensate line from your air conditioner. Seeing water dripping or trickling from this line is normal operation, and you can probably relax.  It's a good idea to have some sort of method to divert or disperse the water so that it doesn't pool or collect next to your house causing other issues/damage. See photo above.
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The emergency drain line is connected to a shallow pan installed below your air handler. This pan is known as the overflow drain pan, secondary pan, or emergency drain pan. This pan is designed to catch water when your primary drain line is clogged in the hopes to protect your attic, ceiling and personal belongings – but is only meant to provide temporary protection.
If you see water coming out of a pipe on the side or rear of your home up high, it means your main condensate line is clogged and you need to call for AC service right away. It is purposely installed high up, so you notice the water dripping sooner than later.