Sparśa (Sanskrit; Pali: phassa) is a Sanskrit/Indian term that is translated as "contact", "touching", "sensation", "sense impression", etc. It is defined as the coming together of three factors: the sense organ, the sense object, and sense consciousness (vijnana). For example, contact (sparsha) is said to occur at the coming together of the eye organ, a visual object, and the visual sense consciousness.
Sparśa is identified within the Buddhist teachings as:
One of the seven universal mental factors in the Theravada Abhidharma.
One of the five universal mental factors in the Mahayana Abhidharma
The sixth link in the twelve links of dependent origination
The Atthasālinī (Expositor, Part IV, Chapter I, 108) states:
Contact means “it touches”. It has touching as its salient characteristic, impact as its function, “coinciding” (of the physical base, object and consciousness) as its manifestation, and the object which has entered the avenue (of awareness) as proximate cause.
Nina van Gorkom explains:
Phassa is manifested by coinciding or concurrence, namely, by the coinciding of three factors: physical base (vatthu), object and consciousness.
When there is seeing, there is the coinciding of eye (the eyebase), visible object and seeing-consciousness; through this concurrence phassa, which is in this case eye-contact, is manifested.
Nina van Gorkom also explains:
Phassa is different from what we mean in conventional language by physical contact or touch. When we use the word contact in conventional language we may think of the impingement of something external on one of the senses, for example the impingement of hardness on the bodysense. We may use words such as touching or impingement in order to describe phassa, but we should not forget that phassa is nāma, a cetasika which arises together with the citta and assists the citta so that it can experience the object which presents itself through the appropriate doorway. When hardness presents itself through the bodysense there is phassa, contact, arising together with the citta which experiences the hardness.