What is a balk? Astros' Ryne Stanek heated after questionable call brings in go-ahead run vs. Dodgers

Astros Ryne Stanek upset after pitcher's first-ever MLB balk gives up winning run to the Dodgers: At what point was I trying to deceive a runner?

Dodgers beat Astros 8-7

Walks and Whiffs: The Story of Ryne Stanek - The Crawfish Boxes