The purpose of guttering systems is to collect water (rain) from the roofing area and disperse the water away from your home. Properly configured downspouts (leaders, drain pipes) are very essential.
A faulty guttering system can contribute to damage to Soffit & Fascia, Shingles, Building Foundations, Driveways, Walkways, Landscaping.
Guttering systems require maintenance to insure protection for your home. Make sure your gutters are free from debris, leaves, granules from shingles, birds nest. The extreme exposure to nature can also cause sealant failures. That is why its great to look into Leaf Protection/Gutter Guard.