Difference between IS and AS keyword in C#

IS keyword is responsible for checks whether  an object is compatible with a given type and the result of the evaluation is a Boolean (true, false).
For example:
        public void emp()
        {
            Employee oEmp = new Employee();
            if (oEmp is Employee)
            {
            // your code
            }
        }

AS keyword is responsible for the casting of the object to a given type or class.
for Example :

Employee o = oEmp as Employee;

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