Filtering Glossary

Browse 14 filtering terms defined in plain English, from the cultural dictionary of computing.

14 Filtering Terms

Allowlist
A list of explicitly permitted entities such as IPs, users, domains, binaries, or actions, with everything else blocked by default. Allowlisting is often...
Anti-Spam
Designed to detect, filter, or suppress unsolicited bulk or abusive messaging. Anti-spam systems often combine sender reputation, content analysis, behavioral...
Block Listing
A security approach that denies a known set of bad items such as IPs, domains, files, or commands while allowing everything else by default. Block listing is...
Content Filtering
The inspection and restriction of content based on rules about type, source, category, or risk, often used for web traffic, email, chat, or uploaded files....
Custom Filter
A user-defined filtering rule or component that screens data, requests, logs, or content according to project-specific logic. Custom filters are common in...
Database Firewall
A security layer that inspects and controls database traffic or queries to block suspicious patterns, unauthorized statements, or policy violations. Database...
DNS Firewall
DNS Firewall is a DNS control that blocks or rewrites lookups for malicious, unauthorized, or policy-violating domains. Security teams use it to enforce trust,...
Egress Filtering
Egress Filtering is network policy that controls which outbound traffic, destinations, ports, or protocols are permitted. Security teams use it to enforce...
Firewall Rules
Firewall Rules is ordered network policy statements that allow, deny, or log traffic based on attributes such as source and port. Security teams use it to...
Ingress Filtering
Ingress Filtering is network policy that restricts inbound traffic based on source, destination, protocol, or routing expectations. Security teams use it to...
Mail Gateway
A server or service that processes email entering or leaving an organization, often enforcing spam filtering, malware scanning, policy checks, and routing...
Packet Filter
A filtering mechanism that makes allow-or-deny decisions based on packet-level properties such as source, destination, protocol, and port rather than full...
Predicate
A function that takes an input and returns a boolean (true/false). Used extensively in filtering, searching, and conditional logic. In SQL it is the WHERE...
Quality Filter
A filter or validation step that screens AI outputs for quality criteria such as correctness, completeness, formatting, or groundedness before they are...

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