Just a question about: function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private

Question

Just a question about: function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private

{
// approve token transfer to cover all possible scenarios
_approve(address(this), address(uniswapV2Router), tokenAmount);

// add the liquidity
uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
owner(),
block.timestamp
);
}

Why it is defined owner() here ?