Agile, Scrum, and SDLC
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Can Agile and Scrum be considered as SDLC?
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They can be considered as parts of SDLC.
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Well, Agile, and Scrum are based on SDLC but they can't be considered SDLC. Agile consists of many methodologies, and Scrum is one of the most famous of them. And SDLC is a process of design and development of a product or service.
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Agile and Scrum cannot be considered SDLC, but they are based on it. I can advise you to study guides on this topic, for example this one about sdlc agile methodology.