• Type 1 diabetes, also called juvenile diabetes or insulin-dependent diabetes is characterized by a complete or near-complete lack of insulin production by the pancreas. People with type 1 diabetes must take daily insulin injections to survive. 
• Type 2 diabetes, the more common form of the disease, is characterized by insulin resistance, meaning that the body does not use insulin properly. While some people with type 2 diabetes may be able to control their blood sugar levels with healthy eating and exercise, others will need medication or insulin injections.

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Diabetes Mellitus, commonly known as diabetes, is a chronic metabolic disorder characterized by elevated blood sugar levels. This occurs because the body either does not produce enough insulin or cannot effectively use the insulin it produces. Insulin is a hormone produced by the pancreas that regulates blood sugar by allowing glucose to enter cells for energy.

There are primarily two main types of diabetes:

• Type 1 Diabetes: An autoimmune condition where the body attacks and destroys the insulin-producing cells in the pancreas. People with type 1 diabetes need to take insulin daily to survive.
  Source: CDC - What is Type 1 Diabetes?
• Type 2 Diabetes: Occurs when the body becomes resistant to insulin, and the pancreas cannot produce enough insulin to overcome this resistance. It is often associated with lifestyle factors like obesity, poor diet, and lack of physical activity.
  Source: CDC - What is Type 2 Diabetes?

Common symptoms of diabetes include:

• Frequent urination
• Excessive thirst
• Unexplained weight loss
• Increased hunger
• Blurry vision
• Slow-healing sores
• Frequent infections

Diabetes can lead to serious health complications, including heart disease, kidney disease, nerve damage, and eye damage, if not properly managed.
Source: NIDDK - Preventing Diabetes Problems