[GregsKia]

ESC OFF turns off Electronic Stability Control. The only real reason you would need it is if you need to let the front tires spin freely if you are in heavy snow/sand/etc. Otherwise ESC uses the brakes and manipulates the throttle to try to give engine power to the wheel with the most traction. ESC has other functions as well, but that is what you would turn it off for.
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The other button is the windshield wiper de-icer. There is a heating element below the FRONT windshield wipers that when activated, will melt ice and snow off the wipers.

 

[GregsKia]

The ESC OFF totally stumped me. I told my grandkids it was an ejector seat button so they better behave.

Haha, that's pretty funny.
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Here is information directly from Kia:

Sedona offers consumers invaluable protection provided by an extensive list of standard safety features, including six standard airbags (dual advanced front and front seat-mounted side air bags, full-length side curtain air bags for all three seating rows); active front headrests; and a four-channel, four-sensor Antilock Brake System (ABS) with Electronic Brake Force Distribution (EBD), which takes into account vehicle load and weight distribution and applies the appropriate stopping force. The EBD system adapts to individual wheel grip conditions to help improve both control and stability. Additional standard safety equipment for Sedona includes a Tire Pressure Monitoring System (TPMS), Electronic Stability Control (ESC) and a Traction Control System (TCS).

In conjunction with the ABS, the TCS uses brake and engine torque intervention to enhance traction during launch and acceleration on slippery road surfaces. If the ABS system detects wheel slip, it signals the engine control unit to adjust torque output accordingly. TCS also senses when one or more wheels spin faster than the vehicle's speed, and if necessary, applies the brakes accordingly. Working together, the two systems limit wheel spin and help the driver maintain control.

Working with the standard ABS with EBD and TCS, the ESC system can apply individual brakes selectively to help control oversteer and understeer as needed to help the driver maintain control on slippery surfaces or during certain emergency maneuvers.