The OGC API - Processes Standard builds on the WPS 2.0 Standard and is modularized. This means that there is a separation between
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Core requirements, that specify basic capabilities and can easily be mapped to existing OGC Web Processing Services;
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More advanced functionality, that is not specified in WPS 2.0.
JSON is the encoding for requests and responses. The inputs and outputs of a process can be any format. The formats are defined at the time of job creation and are fixed for the specific job.
Support for HTML is recommended as HTML is the core language of the World Wide Web. A server that supports HTML will support browsing with a web browser and will enable search engines to crawl and index the processes.