Neglect is a condition of failing to notice stimuli presented from the contralateral side of a brain lesion. It is more commonly observed after damage to the right hemisphere and adversely affects patients’ functional recovery. The prevalence of neglect varies depending on factors such as the location of the brain lesion and the assessment methods used. Neglect can be classified into sensory, (pre-)motor, and representational (imaginal) neglect. Depending on the spatial domain it affects, neglect can be assessed in three areas: within the body (personal space), within reach of the arm (peripersonal space), and beyond the reach of the arm (extrapersonal space). It can also affect different reference frames (egocentric, allocentric). These classification systems are typically considered together. Neglect is a heterogeneous condition with variable symptoms, and patients may present with mixed symptoms. Various clinical tests are used to assess the presence of neglect. Rehabilitation approaches for poststroke neglect vary based on patients’ awareness and active participation, and they rely on top-down and bottom-up mechanisms.