Mother of AD BLOCKING
The 'hosts' file contains the mappings of IP addresses to host names and loaded into memory (cache) at startup. Unix/Linux/Android OS checks the 'hosts' file before it queries any DNS servers, which enables it to override addresses in the DNS. This prevents access to the listed sites by redirecting any connection attempts back to the localhost (127.0.0.1), which is a loopback and traffic is dropped instantly (saving your thousands of money used by network traffic 2G/3G/4G). Another feature of the 'hosts' file is its ability to block other applications (bogus applications) from connecting to the Internet, providing the entry exists.
'hosts' file is used to BLOCK ADs, BLOCK Banners, BLOCK 3rd Party Cookies, BLOCK 3rd Party Page Counters, BLOCK Web Bugs, BLOCK Web Hijackers, BLOCK Phishing Sites, BLOCK Malwares, BLOCK Spywares, BLOCK Trackers, BLOCK Unauthorized Application connections to web and BLOCK other Malicious activities...
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