Question: what is the difference between libor and ibor?
Answer: LIBOR and most other IBORs are intended to measure unsecured interbank lending rates, whereas the proposed RFRs are based on short-term wholesale transactions for unsecured RFRs (i.e. SONIA, TONA and €STR) and repurchase or "repo" transactions for secured RFRs (i.e. SOFR and SARON).