Describe the process of filtering to control access to controversial contents

Internet Filtering

Keyword blocking. Uses a list of banned word or objects terms such as xxx, sex, and nude. The filter searches, If found, it will blocked. Site blocking. Use software to list the websites that will be blocked by using software. The software prevents users from being access the web sites on list. Web rating system. Web sites are rating in terms of nudity, sex, violence and language. Can be done by setting the browser to only accept page with certain level of ratings.