What security issues is OpenZeppelin Address.sol designed to address?

Smart Contracts
1

The comment in the code mentions that it is unsafe, but I do not understand why.
Can someone provide an example when it is unsafe to use solidity call function directly?

 /* @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
*/