<p>A wiki is a website designed for collaborative editing, letting many people create, update, and organize content directly in a web browser.
Wikis prioritize ease of use and openness: pages can be added or changed without technical expertise, and most track every edit so changes can be reviewed or undone.
Key features
- **Collaborative editing:** Numerous contributors can work on pages, sometimes simultaneously.  
- **Edit history:** Every modification is recorded with a timestamp and the editor’s identity or IP address.  
- **Interlinking:** It’s easy to create links between pages, forming an interconnected knowledge base.  
- **Lightweight markup:** Formatting is usually handled by lightweight markup languages (e.g., WikiText or Markdown).  
- **Permission settings:** Access controls vary — from fully open editing to permissions for certain users or groups.  
- **Discussion pages:** Talk or discussion pages let contributors debate edits and organization.
Frequent uses
- Crowd-sourced knowledge resources (e.g., Wikipedia)  
- Internal documentation and company knowledge bases  
- Cooperative writing and shared notes  
- Classroom and educational projects
Pros
- **Fast collaboration:** Contributors can rapidly create and improve content.  
- **Openness:** Visibility into edits and discussions shows how decisions were reached.  
- **Expandable:** Wikis expand easily as contributors add and organize content.
Limitations
- **Vandalism and false information:** Public editing can lead to vandalism or incorrect information.  
- **Inconsistent quality:** Entries may vary in accuracy, style, and completeness.  
- **Organizational issues:** Without clear governance, content may become fragmented or disputed.
Example
- **Wikipedia** — a well-known wiki operated by the Wikimedia Foundation and written by volunteers around the globe.</p>