Frontotemporal dementia (FTD) is a form of dementia characterized by behavioral changes, cognitive decline, and loss of memory. It is the most common subtype of frontotemporal lobar degeneration (FTLD). FTD presents as a behavioral variant with social and personal conduct changes, executive dysfunction, and decreased speech output. Another subtype is 'semantic dementia,' involving language comprehension loss and impaired recognition. 'Primary progressive aphasia' is a third subtype marked by speech production reduction and communication difficulties. Memory is relatively preserved in the early stages. FTD is often linked to parkinsonism or motor neuron disease resembling ALS. Neuropathological changes include frontotemporal atrophy, basal ganglia atrophy, and tau protein deposits in glial cells and neurons.