Glucose is your cell's main energy source but too much or too little is detrimental so the body regulates it's absorption with insulin which signals your cells to allow it to enter from your blood. Think of insulin as the key that unlocks the door that allows glucose to enter the cell. Lack of insulin (or resistance to its use in the case of a type 2 diabetic) locks that door tight leaving excess glucose in the blood.
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Glucose is your cell's main energy source but too much or too little is detrimental so the body regulates it's absorption with insulin which signals your cells to allow it to enter from your blood. Think of insulin as the key that unlocks the door that allows glucose to enter the cell. Lack of insulin (or resistance to its use in the case of a type 2 diabetic) locks that door tight leaving excess glucose in the blood.