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Glossary

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Review the definitions for terms used across Cloudflare's documentation.

TermDefinitionProduct
account

Accounts group one or more members together with specific roles or permissions. Accounts can be associated with any number of domains.

Fundamentals
ACK (Acknowledge)

The final step in the TCP three-way handshake, confirming the establishment of a connection.

Spectrum
active zone

A DNS zone that is active on Cloudflare requires changing its nameservers to Cloudflare's for management.

DNS
address map

A data structure enabling customers with BYOIP prefixes or account-level static IPs to specify which IP addresses should be mapped to DNS records when they are proxied through Cloudflare.

BYOIP
AI crawler

A bot which scrapes content from websites in support of an AI model, including by scraping content for indexing, retrieval augmented generation, or training.

AI Crawl Control
AI models

An AI model is a trained system that processes input data to generate predictions, decisions, or outputs based on patterns it has learned.

Workers AI
alarm

A Durable Object alarm is a mechanism that allows you to schedule the Durable Object to be woken up at a time in the future.

Durable Objects
allowlist

An allowlist is a list of items (usually websites, IP addresses, email addresses, etc.) that are permitted to access a system.

WAF
anycast

Anycast is a network addressing and routing method in which incoming requests can be routed to a variety of different locations. Anycast typically routes incoming traffic to the nearest data center with the capacity to process the request efficiently.

Cloudflare WAN
apex domain

Apex domain is used to refer to a domain that does not contain a subdomain part, such as example.com (without www.). It is also known as "root domain" or "naked domain".

DNS
API call

Also known as an API request. An API call is a message sent to a server asking an API to provide a service or information.

API Shield
API endpoint

The API endpoint is the location where API calls or requests are fulfilled. API Shield defines endpoints as a host, method, and path tuple.

API Shield