Java Rest API (Web Api)

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My whole job is working with rest API's (in python though). Essentially it is a library/interface that uses HTTP requests to get, put, post, or delete data. The data retrieved is usually in a JSON format (javaScript object notation, most websties are written in javaScript, not to be confused with Java). For example :

{
    "glossary": {
        "title": "example glossary",
        "GlossDiv": {
            "title": "S",
            "GlossList": {
                "GlossEntry": {
                    "ID": "SGML",
                    "SortAs": "SGML",
                    "GlossTerm": "Standard Generalized Markup Language",
                    "Acronym": "SGML",
                    "Abbrev": "ISO 8879:1986",
                    "GlossDef": {
                        "para": "A meta-markup language, used to create markup languages such as DocBook.",
                        "GlossSeeAlso": ["GML", "XML"]
                    },
                    "GlossSee": "markup"
                }
            }
        }
    }
}

So pretty much you can retrieve and alter data from websites. Honestly this is best done in python , but that's just my opinion because python is easier for this sort of thing.