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Understanding Ruby Metaprogramming and DSLs

A DSL, or Domain Specific Language, is a language that has a specific purpose rather than a general purpose, like C or Java. One of the most popular DSLs is SQL because it’s the standard for querying a relational database and its syntax is specific to activities such as sorting, filtering, and displaying data.
SQL falls under the category of external DSLs, which means it requires its own parser and implementation of all of the necessary components. Other examples of external DSLs are Gherkin, for writing feature files, Make Files, for building C and C++ applications, and HTML, for declaring webpages).

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