what is return value `uint liquidity` in IUniswapV2Router addLiquidity?

Question

this is from IUniswapV2Router01.sol:

function addLiquidity(
    address tokenA,
    address tokenB,
    uint amountADesired,
    uint amountBDesired,
    uint amountAMin,
    uint amountBMin,
    address to,
    uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);

What does the return value uint liquidity represents?

Answer 1

Represents how much LP token you will received after you provided liquidity to the pool.

Uniswap v2 checks the ratio of token A and token B in the pool and only lets you add liquidity according to that ratio.

So those 3 values you get in return of calling addLiquidity() are the amount of token A the protocol allows you to stake, the amount of token B, and the number of LP token you get to represent the liquidity you just provided.

You can later use those LP token to get your liquidity back from the pool.

Hope this helps!