DevOps is the combination of people, processes, and tools that increase the velocity of delivering applications and services: This speed will serve customers in a better way and your organization will compete more effectively in the market.
In DevOps model development and operations teams are no longer isolated. In few scenarios, these teams work together as an isolated team.
DevOps consists practices of automating processes which were manual and slow before DevOps introduced. With advanced tools and processes, applications are quickly and rapidly evolved.