It is a computer software program that helps to block obscene content from reaching users' screens. They are also commonly used to block unauthorized access to websites. Filtering can help to prevent people from viewing offensive or illegal material. It can also be useful for parents who want to restrict what their children see online. Filtering can also help to block pop-ups and other annoying ads.

Web filter is a process of selectively allowing or blocking items that are posted on the internet. There are pros and cons to using web content filtering tools, so it's important to weigh them before making a decision. 

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Pros of web content filtering:

• Web content filtering can protect users from inappropriate content.
• Web content filtering can help to keep websites clean and organized.
• Web content filtering can help to prevent user confusion and frustration.
• Web content filtering can help to reduce website traffic congestion.
• Web content filtering can help to improve website SEO rankings.
• Web content filtering can help to reduce website spamming and spam comments.
• Web content filtering can help to reduce website cyber-bullying.
• Web content filtering can help to improve website privacy and security.
• Some people believe that web content filtering can help keep children safe from inappropriate content online.

It helps protect your computer from online threats. When you visit a website, your web filter checks the website for malicious content. If it finds any, the web filter will block it from being displayed on your screen.