The Amazon Product/Reviews/Keywords API is a complete source of information about products listed in Amazon, allowing developers to consume product reviews based on the ASIN (Amazon Standard Identification Number). To use this API, developers need to sign up for a free RapidAPI developer account, subscribe to the Amazon Product/Reviews/Keywords API, and opt-in for the basic subscription that gives 25 requests for free. The API supports multiple endpoints for querying information about products and their descriptions, price, reviews, and images. To get product reviews, developers need to use the "GET Product Reviews" endpoint and provide the ASIN as a parameter. The response contains the first page of review comments on a product, which can be fetched subsequent pages by triggering the API with specific page numbers.