Dev-Ops
DevOps is a set of practices that combines software development and IT operations. It aims to shorten the systems development life cycle and provide continuous delivery with high software quality. DevOps is fully complementary with Agile Development but goes several steps further.
DevOps spans the entire delivery pipeline to shorten timeframes and increase quality:-

Agile
The Agile Manifesto of Software Development put forth a groundbreaking mindset on delivering value and collaborating with customers.
Agile's four main values are expressed as:-
Phases of Agile Methodology includes:

Scrum Agile
Scrum is the most popular Agile development framework because it is relatively simple to implement. It also solves a lot of problems that software developers have struggled with in the past, such as convoluted development cycles, inflexible project plans and delayed production.
