Learn in the textbookDistortions of the Information Environment and Countermeasure Technologies
DefinitionFiltering (フィルタリング) is a mechanism that automatically blocks access to harmful or inappropriate websites and information according to conditions set in advance.
ExplanationBlocking methods include, for example, the blacklist method, which registers sites that must not be viewed, and the whitelist method, which registers only the sites that may be viewed. Besides software installed on a device, filtering can also be offered as a feature by carriers or service providers.
AnalogyIt works like a water filter that strains out debris. Whatever gets caught in the mesh is stopped before it reaches the device.
Memory hookIt is the same "filter" as in a water purifier. Just recall how a filter strains things out.