product selection Microsoft Project Professional or Project Server

Dear Experts
We have a requirement to use the Project Management Solution which to be of On-Premise deployment , to start with we require 04 users and these 4 users should have insights/able to track project tasks and they have to collaborate for this requirement I can see the on-Premise product of Microsoft Project Professional but I am not sure this works only for standalone user OR should we have to go for Microsoft Project Server please suggest on which product to procure for our need as mentioned above.
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David Johnson, CD, MVPRetiredCommented:
Project Server is an add on to Sharepoint and users can use Project Desktop or the Web to manage and collaborate  projects.
D_wathiAuthor Commented:
Thanks for the update, would like to understand if we subscribe for Project Professional on-premises is it a standalone installation on each desktop and also if installed in 04 desktops can these 04 users will be able to collaborate, please suggest based on this will have to make decision to go for Project Professional OR Project Server.
David Johnson, CD, MVPRetiredCommented:
to collaborate you need server.  The web app functionality is limited compared to the desktop version.  The clients normally are stand alone but you can set them to connect to the server.

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Project Management

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