In comparison to Infrastructure-as-a-Service (IaaS) and Software-as-a-Service (SaaS), Platform-as-a-Service (PaaS) has experienced a slower rate of adoption. However, PaaS is coming into its own as evidenced by increased usage and top technology companies such as HP and IBM supporting open source projects like Cloud Foundry by bringing their own PaaS to market.
PaaS is important because apps are an important part of our lives. With this relatively new dependency on web and mobile applications, organizations need to find a way to automate their app deployment and management process just to stay in the game. If you are not looking for a way to speed up your pipeline, you can bet that your competition is. And PaaS is a critical component to achieving this.
There are a lot of PaaS offerings (including some that only masquerade as an actual PaaS), so you need to make sure that you are evaluating an enterprise PaaS and not just one that claims to have the functionality "like it."