Proxy services are "middle man" servers that relay requests and responses for a specific service like web access to help reduce bandwidth usage, increase privacy, implement censoring or filtering software, get around censoring and filtering software, and to log activities of users within a closed environment.
Filtering products prevent unauthorized viewing of unapproved or questionable Internet web sites and images. These are the same products used by libraries and schools to prevent children and young people from viewing websites that contain violent, pornographic, or other unsavory material.