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This article delves into the reasons why Google utilizes a single repository to store billions of lines of code. It explains that having a single repository allows for better code sharing, version control, and collaboration among developers. The article also discusses the challenges and benefits of managing such a large codebase, including the use of advanced tooling and automation. By maintaining a unified code repository, Google aims to foster a culture of code ownership and empower its engineers to easily access and modify code across various projects. Overall, the article highlights the advantages and strategies behind Google's decision to store vast amounts of code in a single repository.