SynTPEnh.exe is Synaptics touchpad driver helper. Required for touchpad features to work. More information can be found here.

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Synaptics TouchPad? devices are touch-sensitive pads that sense the position of a person's finger on its surface to provide screen navigation, cursor movement, and a platform for interactive input. Synaptics TouchPad devices are the industry leading solution, known for their durability, reliability, and accuracy. Synaptics TouchPad solutions can be custom designed to meet your requirements for sizes, thickness, feature functionality and electrical interfaces.

Synaptics TouchPad devices also offer advanced device driver features that allow end users to customize their TouchPad device settings to meet their individual preferences.