The term 'It'll' is a contraction of the phrase 'it will, ' which is used to express a future event or action. It is often used in informal contexts, such as when speaking with friends or family. The phrase 'all be fine' is an expression of hope and optimism that everything will turn out alright in the end. Together, the phrase 'It'll all be fine' is a reassuring statement that things will work out in the end.