Ad filtering or ad blocking is a service which removes or alters advertising content in a webpage. This content can be represented in a variety of ways including pictures, animations, text, or pop-up windows. More advanced filters allow fine-grained control of advertisements through features like blacklists, whitelists, and regular expression filters. Certain security features also have the effect of disabling some ads.
The immediate benefits include cleaner looking webpages free from advertisements and lower resource-usage (bandwidth, CPU, memory, etc.). One drawback is that advertisements are a major source of revenue for many websites. However, the actual loss of revenue, when present, is difficult to measure.
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