SharePoint is a platform which exists as both an intranet site and as a collaboration tool. Many projects require collaboration with a number of external agencies and companies. SharePoint is a solution which can support and enhance projects to achieve their goals. However, external sharing needs to be conducted carefully. Who you share with, over what time period, what content and what sites are all important considerations in order to keep your content secure.
Your IT team will want to ensure the sharing capabilities is as limited as possible, but you will want to share it with your whole project team. There are a number of methods of sharing therefore you need to find the appropriate method for your business. From sharing individual documents to Teams or sites, you can be prescriptive about what you are choosing to share and how.