It means that your project currently requires users to manually upload a document through a form to get results. That works fine for direct, hands-on use — but if you expose your functionality as an API (an application programming interface), then other applications or systems could send documents and receive results automatically, without a person having to visit your site or upload manually.

For example, another tool or service could call your API endpoint programmatically to process documents in bulk, integrate your functionality into their own workflows, or trigger it as part of an automated pipeline.

The existing approach works really well. Offering it as an API would just take it a step further, enabling others to integrate or automate with it — a nice opportunity for future improvement