An "Internet Filter" is a hardware or software solution that prevents access to certain undesirable areas of the internet. They filter by various methods - some by comparing site requests with a list of previously known bad URLs and preventing viewing if they are listed, others by scanning incoming data and blocking it if it contains undesirable keywords, file types or other parameters. Sometimes the parent can control or create the list of keywords or sites filtered, sometimes not.
A children's browser is a special parent controlled browser like Internet Explorer or Netscape which allows access only to sites that are known to be suitable for children. Usually the browser operates with its own list of known good sites, and will not allow access to any others. They also frequently have email \ chat filtering ability or dedicated email\chat facilities that do not allow 'rude words' etc. They often have some parent-defined password facility or access control that prevents the child from exiting and using a normal browser, or reaching the desktop or other software.
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