that's how it isUsed to emphatically confirm that something is true or corresponds to reality. The related forms так оно и было and так оно и будет mean “that's how it was” and “that's how it will be.”
RU: Ты думаешь, он устал? — Да, так оно и есть.
EN: Do you think he’s tired? — Yes, that’s how it is.