will be ... andA combination of 것 (thing/what) and 이고 (is and). It connects a noun or nominalized clause to what follows, often expressing “will be ... and” or “is ... and,” depending on context.
KO: 그것은 네가 선택한 것이고, 나는 네 결정을 존중할게.
EN: That is what you chose, and I’ll respect your decision.