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Glossary A–Z

Terms starting with D

30 terms. Search all 545 terms →

Content & Email

DKIM

DKIM is an email authentication method that adds a cryptographic signature proving a message is genuine. It protects your domain and improves deliverability.Read definition →Content & Email

DMARC

DMARC is an email authentication policy that tells receivers what to do with messages failing SPF or DKIM. It stops spoofing and reports domain abuse.Read definition →Web Development

DNS

DNS is the system that translates website names into the numeric addresses computers use to find them. DNS mistakes can take your whole site or email down.Read definition →Web Development

DOM

The DOM is a live tree of objects that represents a web page, letting code read and change its content and structure. The DOM is how pages become interactive.Read definition →Web Design

Dark Mode

Dark mode is a color scheme with light text on a dark background, offered as an option. It meets user expectations, reduces glare, and signals a modern product.Read definition →Analytics

Data Layer

A data layer is a structured object on a page that holds clean data for analytics and marketing tags to read. It keeps tracking accurate and resilient.Read definition →Analytics

Data-Driven Attribution

Data-driven attribution uses an algorithm to assign conversion credit by each touchpoint's real impact. It directs budget to what truly influences buyers.Read definition →Web Development

Database

A database is an organized collection of data stored so it can be queried, updated, and managed efficiently. Databases power dynamic sites and apps.Read definition →PPC

Dayparting

Dayparting schedules ads to run during specific hours or days when your audience converts best, and pauses or lowers bids when performance is weak.Read definition →AI / GEO

Deep Learning

Deep learning is a form of machine learning that uses many-layered neural networks to learn complex patterns from data. It drives modern AI breakthroughs.Read definition →Content & Email

Deliverability

Deliverability is the ability of your emails to reach subscribers' inboxes instead of the spam folder. It determines whether email marketing works at all.Read definition →PPC

Demand-Side Platform

A demand-side platform, or DSP, lets advertisers buy ad inventory across many exchanges from one interface. It centralizes programmatic targeting and bidding.Read definition →Web Development

Dependency

A dependency is an external code library a project needs to function. Managing dependencies well keeps sites secure, stable, and easy to maintain.Read definition →Web Development

Deployment

Deployment is the process of releasing code from development into a live environment where users can access it. Smooth deployment means safe, fast releases.Read definition →Web Design

Design Brief

A design brief is a document that defines a project's goals, scope, and requirements before work begins. A clear brief prevents costly rework and scope creep.Read definition →Web Design

Design System

A design system is a documented library of reusable components and standards. It keeps products consistent and speeds up design and development work.Read definition →Web Design

Design Token

A design token is a named value that stores a design decision like a color as data. Tokens keep a product consistent and make sitewide changes and theming fast.Read definition →Social Media

Direct Message

A direct message, or DM, is a private message between users on a social platform. Brands use DMs for support, leads, and personal one-to-one conversations.Read definition →Analytics

Direct Traffic

Direct traffic is visitors who arrive with no trackable referral source. It often reflects brand strength but can also reveal hidden gaps in your tracking.Read definition →SEO

Disavow

To disavow is to ask Google to ignore specific harmful backlinks when assessing your site. Disavowing bad links can protect a site from link-based.Read definition →PPC

Display Network

The Display Network shows image and banner ads across millions of websites, apps, and videos. It builds awareness and powers remarketing at massive scale.Read definition →Web Development

Docker

Docker packages an app and everything it needs into a portable container that runs the same everywhere. It ends the works on my machine problem.Read definition →SEO

Dofollow

A dofollow link is a standard link that passes authority and helps the target page rank. Dofollow links are the ones that build ranking power.Read definition →SEO

Domain Authority

Domain Authority is a third-party score predicting how well a website is likely to rank.Read definition →Web Development

Domain Name

A domain name is the human-readable address people type to reach your website, like example.com. Your domain is the foundation of your online identity.Read definition →Content & Email

Double Opt-In

Double opt-in is a signup process that asks new subscribers to confirm by email before joining a list. It builds a cleaner, more engaged, and compliant list.Read definition →Content & Email

Drip Campaign

A drip campaign is a series of automated emails sent on a schedule to guide subscribers toward action. It nurtures leads steadily without manual effort.Read definition →SEO

Duplicate Content

Duplicate content is identical or very similar text that appears at more than one URL. Duplicate content splits ranking signals and can bury your best.Read definition →SEO

Dwell Time

Dwell time is how long a searcher stays on a page before returning to results. Longer dwell time signals content that satisfies intent and holds rankings.Read definition →PPC

Dynamic Search Ad

A dynamic search ad uses your website content, not keywords, to automatically target relevant searches and generate headlines, filling gaps in coverage.Read definition →