How does one give meta_key a name in WordPress?

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I am quite new to WordPress and I have a question about meta_key. I saw a query to dispay custom fields of meta box that saved start and end dates. One of the parameters used in the query is the meta_key, but where does one find the name of the meta_key in the meta box? Or does one gives the meta_key a name? If so: how?

This question is a but basic perhaps and maybe it is not wel put, but i’m eager to learn. Things like meta_key seem to be fundamental, but it’s so hard to find a explanation of these concepts in plain english.

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Thanks in advance and regards,
Louis

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  1. Study this Codex article: http://codex.wordpress.org/Custom_Fields

    WordPress has the ability to allow post authors to assign custom
    fields to a post. This arbitrary extra information is known as
    meta-data. Meta-data is handled with key/value pairs. The key is the
    name of the meta-data element. The value is the information that will
    appear in the meta-data list on each individual post that the
    information is associated with.