Adult-onset diabetes mellitus is a medical condition that affects millions of people worldwide. The disease is also known as type 2 diabetes, and it is caused by the body's inability to properly use insulin. There are several synonyms for this condition, including non-insulin-dependent diabetes, late-onset diabetes, and maturity-onset diabetes. These terms are commonly used to describe type 2 diabetes in older adults, although the condition can also occur in younger individuals. Whatever term is used, it's important to understand the symptoms and complications associated with adult-onset diabetes mellitus to ensure proper diagnosis and treatment.