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SAP / SAP Mid Level (3 to 8 yrs) Interview questions

What is an OData service in the context of SAP Fiori/Gateway?

An OData service is the actual runtime endpoint that exposes a defined set of entities (data) and operations (CRUD, actions) over HTTP, following the OData protocol — the bridge a Fiori app actually calls to read and write backend SAP data, generated either through classical SAP Gateway service implementation or, in newer development, directly from a RAP service definition/binding.

/sap/opu/odata/sap/Z_CUSTOMER_SRV/
    $metadata            "  describes the service's structure
    CustomerList         "  the actual data entity set
    CustomerList('123')  "  a single entity by key

Each service has a defined base URL, a metadata document describing its entities and their fields, and individual entity sets that support the standard OData operations (GET, POST, PUT/PATCH, DELETE) mapped to create/read/update/delete against the underlying business data.

What does an OData service expose over HTTP?
What does the $metadata endpoint of an OData service describe?

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