As your SharePoint environment starts to become populated with important business documents, it's important to manage access properly. Users who require information to do their jobs should be able to easily locate and then access information. In cases where you have sensitive information on the portal, it's crucial that only users who have a business requirement to access it have the rights to do so. Because SharePoint will become a central storage location for important business information, it is critical that this information be protected. This means locking out those who could cause harm to the system or should not have access to information.
9.2.1. Understanding the SharePoint Membership Groups
A SharePoint site group defines the specific roles and permissions for users. By default, SharePoint has several groups, which vary depending on the type of site you create and the type of activities users perform on that site. The following list shows the different types of site groups that SharePoint has to offer and explains the purpose of each:
Site Members: Members can view, add, edit, or delete content in existing site elements, such as lists and document libraries. In a collaborative setting, team members in this group generally have no reason to create new instances of lists or libraries but participate by constantly adding and reading existing content. This is the group that most closely resembles the "Contributor" role from WSS version ...
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