Gait analysis is where your walking pattern is examined. There are various components of the gait, which can cause problems if walking alignment or timing is faulty.
Gait analysis is part of the biomechanical assessment.
A biomechanical examination and gait analysis may indicate that you need to wear orthotics. Orthotics (or orthoses) are inserts that can improve alignment and alter malfunction to ease aches pains and reduce incidence of future structure related symptoms.