Suggest an editImprove this articleRefine the answer for “What does the "one business function, one service" principle mean?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)The **"one business function, one service"** principle means that each microservice should be responsible **only for one specific task** within the business and should contain all the logic and data needed for it. **Key point:** one service equals one complete business function - it is autonomous, independent, and can live, update, and scale separately from the others.Shown above the full answer for quick recall.Answer (EN)ImageThe **"one business function, one service"** principle means that each microservice should be responsible **only for one specific task** within the business and should contain all the logic and data needed for it. --- ### The meaning Instead of one large universal application, the system is built from independent "building blocks", each of which does **one thing well**. For example: - the **authentication** service handles only login and registration, - the **payments** service handles only transaction processing, - the **catalog** service handles only products and categories. --- ### Why this is needed - It simplifies understanding and maintaining the code. - It allows scaling only the part that needs it (for example, payments during a sales spike). - It makes the system more resilient: a failure in one service does not break the rest. - It lets different teams develop their parts independently. --- **Summary:** > One service equals one complete business function. > It is autonomous, independent, and can live, update, and scale separately from the others.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.