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What is a primary key?

What is a primary key? Here are some definitions.

Noun
  1. (computing) In the design of a database table, the primary key (abbreviated PK) is selected among the non-empty set of candidate keys. The PK is a column (or an irreducible group of columns) able to identify every row of the table.
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Examples
We recommend to you to prefer the installation of a numerical primary key for each one of your tables.
Metadata table A two dimensional relational table containing a primary key field and descriptive fields.
The primary key to access to the NICTs is literacy, and this reality applies equally to rich and poor societies.
The definition of the primary key is the only difference between the structure of the two tables.
Herein is a primary key of living the Spirit-filled life and having a Spirit-filled ministry.
The additional tables contain the same primary key as the main table and any additional fields.

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