Project Management is about defining and overseeing projects and resources to achieve organizational objectives.
Your organization has objectives, and to achieve those objectives, you need resources. To make sure objectives are met and resources are efficently utilized, you and your team define and clarify the objectives, plan what you need to do, estimate required resources, i.e. labor, materials, services etc. sequence the activities and estimate how long it takes to get all done. Once the plan is ready, you deploy resources to complete those activities, at the same time, monitor and control progress, scope, quality, cost etc. carry out procurement, forecast your cost at completion and schedule, and adjust you plan along the way until the project is successfully closed.
When you drive a car from point A to point B (your orgnizational objective), you decide on your route (your plan) and check your fuel tank whether there is enough fuel in the tank for you to reach your destination (resource requirements). You try to estimate how long it takes for you to reach there (schedule). Once you are on the road, you monitor how far you have traveled, monitor your fuel level, if necessary you procure more fuels along the way, estimate your time of arrival, until you finally arrived your destination. Project Management is like this. Sounds easy. But there are various knowledge, skills, tools and techniques to utilize to maximize the likelihood of project success within the constraints of scope, cost, schedule and quality requirements. Good project management leads to project success and efficient utilization of resources, bad project management leads to failure and waste of precious resources.