What is ADD and how it different from ADHD?

ADD: Attention Deficit Disorder (Outdated Name)

This outdated term refers to a lack of attention without impulsivity or restlessness. It includes primarily inattentive symptoms of ADHD.

ADHD: Attention Deficit Hyperactivity Disorder

ADHD is a neurodevelopmental condition that affects attention, impulsivity, and/or hyperactivity. Inattentive, impulsive/hyperactive, and combined types of ADHD are three common types.