CAP Theorem

Lesson in the Backend Developer Roadmap · Stage 21: Scaling Databases

Last updated 14 September 2026

What is CAP Theorem?

CAP Theorem states distributed systems can only guarantee two of three properties: Consistency (same data across nodes), Availability (system responds to requests), and Partition tolerance (operates despite network failures). Guides distributed system design decisions and database selection.

Study this in the interactive course See the whole Backend roadmap

Free resources to learn CAP Theorem

ArticleWhat is CAP Theorem?
ArticleAn Illustrated Proof of the CAP Theorem
ArticleCAP Theorem and its applications in NoSQL Databases
VideoWhat is CAP Theorem?

CAP Theorem: common questions

Can I learn CAP Theorem in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain CAP Theorem in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this CAP Theorem tutorial for beginners?

It is lesson 130 of 155 in the free Backend roadmap, in stage 21, Scaling Databases. If you are new to Backend, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.