Online ADHD Test Free: Understanding Attention-Deficit/Hyperactivity Disorder Through Self-AssessmentAttention-Deficit/Hyperactivity Disorder (ADHD) is a neurodevelopmental condition that typically starts in youth and can continue into adulthood. It is identified by symptoms such as inattention, hyperactivity, and impulsivity, which can lead to substantial obstacles in individual, scholastic, and professional settings.