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What are the teeing ground markers used for in golf?

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Tiger Woods follows through on his golf swing after teeing off, standing in tall grass with spectators watching in the background at St Andrews Golf Links. — golf American golfer Tiger Woods competing at the British Open (Open Championship) at St. Andrews, Fife, Scotland, 2005.

In golf, the teeing ground markers are used to indicate the front boundary of the starting area for each hole.1

The teeing ground is defined as a rectangular space that extends two club lengths in depth directly behind the line created by these two markers. Players are required to tee their ball anywhere within this designated space before striking it toward the hole.1