1. plural of backend; the back or rear part of something, or the part not visible to users
Usage: computing: the server-side infrastructure and databases that support an application; general: the hidden or less prominent part of a system or organization
2. in computing, the servers, databases, and logic that process data and handle requests, as opposed to the user-facing interface
Usage: technical; computing

Examples

• The website's backends handle millions of transactions every day.
• Our development team maintains both the frontends and backends of the application.
• The backends of the buildings face the alley.
• Developers need to optimize the backends to improve response times.
• The company invested in upgrading their backends to support more users.
• Multiple backends work together to process customer requests.