An insulin pump delivers insulin directly, without messing with syringes and bottles of insulin.

The American Diabetes Association mentions these likely benefits:

• No more single injections of insulin.
• More accurate dosing and delivery of insulin.
• More stable blood sugar, including fewer severe lows.
• Greater flexibility in when and what you eat.
• No unpredictable reactions to long-acting or intermediate-acting insulin.

Source: HealthDay