It is important for all of the people in an organization to work towards the same goal. It is often called the mission. The mission might be implicit or explicit to its members. Expressed explicitly, it often takes the form of a mission statement.
Visions are a picture of what success would look like in the future, both for the people served by the organization and for the organization itself. During strategic planning, explicitly articulating that vision in a statement like the mission statement can be highly motivating.
Values represent the overall priorities of how the organization wants to work toward its mission. Values can be seen in the way people work together in an organization.
When working toward the mission, these are the overall, most important matters and activities for members to focus on. Like the mission, vision, and values, they might be implied or explicit among members.