Sole custody is a type of custody where only one parent has the right to make important decisions about how to care for and raise a child. It includes the right to make decisions about the child's health, education, and religion.
The parent with sole custody may have to discuss the issue with the other parent before making an important decision. But the parent with sole custody can make the decision even if the other parent disagrees.
Other people, for example, grandparents, can also apply to the court for custody.