Alibaba Qwen3.5 9B

Explain what an API is to someone who has never written code. Do not use a restaurant or waiter analogy. Plain prose only — no headings, bullet points, or markdown formatting. Maximum 50 words.

An API defines how software systems communicate. It provides instructions so one program can request data from another without building everything from scratch. This allows distinct apps, like weather services or payment processors, to function together inside larger platforms smoothly and reliably.

A two-person startup is deciding whether to build their own user authentication or use a hosted provider. Give them a clear recommendation, then the single strongest argument against your own recommendation. Plain prose only — no headings, bullet points, or markdown formatting. Maximum 150 words.

You should use a hosted authentication provider rather than building your own system. Security compliance and infrastructure maintenance are too complex for a two-person team, making an external service the safer choice that lets you focus on product development. However, the strongest argument against this recommendation is vendor lock-in. Once integrated deeply, switching providers becomes difficult because user data must be exported during migration, which can cause friction and loss of trust. If the provider raises pricing or alters their terms, you are forced to accept these changes or incur massive migration costs. This dependency limits your long-term strategic flexibility more than the initial cost savings gained by using their service. Ultimately, owning your core infrastructure is preferable despite the complexity because it prevents an external party from controlling access to your entire community in the future.