filter
noun [ C ]
IT uk/ˈfɪltər/ usa computer program that receives and processes information before displaying it or preventing it from being seen:
Junk email filters help define which email messages are spam.
This web filter enables administrators to monitor user behaviour.
filter
verb [ T ]
IT uk/ˈfɪltər/ usto use a computer program to process information before displaying it or preventing it from being seen:
The company, whose products filter email and internet content, confirmed a record second quarter yesterday.
filtering
noun [ U ]
Email filtering is the removal of unwanted email, for example spam or a phishing attempt, before it reaches your mailbox.