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Flask (web framework)
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<p>Flask is a micro <a href="/facts/Web_framework/8f1CVHDX">web framework</a> written in <a href="/facts/Python_/YbuGqofa">Python</a>. It is classified as a <a href="/facts/Microframework/ekXhUpG2">microframework</a> because it does not require particular tools or libraries. It has no <a href="/facts/Database/VYcpkevb">database</a> abstraction layer, form validation, or any other components where pre-existing third-party libraries provide common functions. However, Flask supports extensions that can add application features as if they were implemented in Flask itself. Extensions exist for <a href="/facts/Object%E2%80%93relational_mapping/sjIPEIfq">object-relational mappers</a>, form validation, upload handling, various open authentication technologies and several common framework related tools. </p><p>Applications that use the Flask framework include <a href="/facts/Pinterest/qAHQpuWN">Pinterest</a> and <a href="/facts/LinkedIn/Iq2IcNMt">LinkedIn</a>. </p>