What is project management software?

This is my view of the subject of your question:

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Project management is the process of seeing that all aspects of accomplishing a given task are successfully accomplished. The task might be relatively simple like moving a set of offices from one city to another. It could also be as complex as building a bridge, a high rise building or a manufacturing facility.

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Any of these jobs requires the identification of all of the individual tasks, materials, people, permits and other things needed for a successful result. Scheduling all of this can be very complicated. There are various software packages that can aid the manager and the staff in keeping track of everything and adjusting the plan as needed. 

Project management software helps project managers and teams collaborate and meet goals on time while managing resources and cost. Functions may include task distribution, time tracking, budgeting, resource planning, team collaboration, and many more.