"योऽयं स्वभावो लोकस्य सुखदुःखसमन्वितः ।

              सोऽङ्गाद्यभिनयोपेतो नाट्यमित्यभिधीयते " ।।

                                                       -Natyashastra (119)

Natya  is the depiction of the nature of the world possessing pleasure and pain through speech, songs, gestures , music and other (such as, costume, makeup, ornaments etc).