Definitions beginning with O

OAI-SearchBot

OpenAI crawler used to enable pages to appear in ChatGPT search features when the website allows it.

In practice: consult OpenAI documentation for its search role before interpreting a robots.txt rule.

OAuth

Authorization framework delegating limited access to resources. OAuth 2.0 alone does not define user authentication; OpenID Connect adds that function.

Reference: IETF · RFC 6749 · OAuth 2.0 · Source consulted 2026-10-31

Source consulted : OAuth · 2026-10-17

In practice: define requested permissions and test denial, expiry and revocation.

Object storage

Storage that keeps files as objects with metadata, often in cloud infrastructure.

In practice: check backups, intended public access and media recovery.

Observability

Ability to understand a system’s internal state from metrics, logs, traces and events. Connect signals to a diagnostic question and scope. A missing trace may reflect incomplete instrumentation rather than absence of activity.

Reference: OpenTelemetry · Observability primer · Source consulted 2026-10-25

In practice: connect each alert to an action and a person responsible for it.

Off-page SEO

Visibility signals earned outside the website, including editorial links, citations, reputation and local presence.

In practice: Assess mentions and links by context and credibility, beyond their number.

Omnichannel

Coherent organization of physical and digital touchpoints so the journey remains continuous across channels.

In practice: Check that an enquiry started on one channel can continue with context on another.

On-page SEO

Optimization of elements within a page: content, headings, links, media, HTML structure and intent match.

In practice: Check title, answer, navigation and helpful links on the rendered page.

Online reputation

Online reputation formed by reviews, mentions, content, search results and public responses associated with an entity.

In practice: Group feedback by theme and respond with verifiable facts rather than a stock reply.

Open Graph

Metadata telling social platforms which title, description and image to use when a page is shared.

In practice: Preview title, summary and image in a real share on target platforms.

Open source

Software whose source code is accessible and may be studied, modified or redistributed under its license terms.

In practice: Review licence, maintenance and dependencies before integrating the project.

OpenAPI

Specification for describing HTTP APIs, including operations, parameters, models and responses. An OpenAPI document describes a contract; it does not prove that the deployed service follows it.

Reference: OpenAPI Initiative : Specification

Source consulted : OpenAPI Initiative · 2026-10-17

Compare the document with a real response, including a refusal and an absent optional field.

OpenID Connect

Authentication protocol built on OAuth 2.0. It uses an ID Token to convey claims about the user; an access token has a different purpose.

Reference: OpenID Foundation · OpenID Connect Core 1.0 · Source consulted 2026-10-31

Source consulted : OpenID Foundation · How OpenID Connect works · 2026-10-31

Opt-in

Explicit action by which a person agrees to receive a communication or a specified form of processing.

In practice: retain the wording and context of the person’s choice.

Opt-out

Mechanism allowing a person to refuse or stop a communication or previously authorized processing.

In practice: Make refusal or withdrawal easy to find and test its actual effect.

Organic click

Visit resulting from a click on an organic result, distinct from an impression or later conversion.

In practice: connect clicks to useful visits, not only volume.

Organic result

Natural result displayed by a search engine without directly purchasing its placement.

In practice: Review snippet and landing page together to understand click quality.

Organic traffic

Visits coming from natural search engine results, excluding paid advertising links.

In practice: Connect visits to useful pages and enquiries before interpreting an overall increase.

Original content

Information based on an editor’s own observation, method, experience or analysis and explained with checkable context.

In practice: show a method, observation or example from your own work.

Outbound link

Link leading from a page to another website. It can help readers consult a source or complementary service when the destination is explicit and relevant. Context, resource reliability and any commercial relationship matter more than reaching a target number of links.

Reference: Google Search Central : Link text and qualification · Source consulted 2026-10-18

In practice: open the exact destination and check that it supports the nearby claim. Prefer the specific page to a general homepage. If a link is advertising or user-contributed, qualify it appropriately in code and make the relationship understandable to readers.

Outdated content

Page or document whose decisive information is no longer accurate or whose purpose no longer exists.

In practice: flag any offer or date that is no longer valid.

Overlay

Visual layer displayed above the main content, for example for a modal, menu or contextual information.

In practice: Check closing, focus order and access to covered content on small screens.

OWASP

Open community publishing reference resources on application security, including a list of common Web risks.

Reference: OWASP Foundation · About · Source consulted 2026-10-31

In practice: Use the risk categories to organise tests on your actual journeys.