Hello and thanks for the question. It's a good one.
Type 1 diabetes also known as juvenile diabetes is a chronic condition often diagnosed in the young years of someone's life. It is actually an autoimmune disease and results in the destruction of the cells in the pancreas that make insulin. It's often genetic. This person will have little to no insulin production. This person requires insulin.
Type 2 diabetes formerly known as adult onset diabetes happens usually a bit later in life and is greatly impacted by the individual. One can typically prevent type 2 diabetes by lifestyle choices of proper weight, exercise and eating habits. This is considered non insulin diabetes. With type 2 diabetes, blood sugar is too high. The body doesn't make insulin well anymore or use it well. It's usually slow developing and can be reversed.
I hope this answers your question. Please let us know if you would like any more information!