There is a number of block cipher modes, including ECB, CBC, CFB, OFB, CTR and others. After reading "Serious Cryptography. A Practical Introduction to Modern Encryption" by Jean-Philippe Aumasson, where the author described CFB and OFB as folklore which no one really uses, I am curious which ones are most commonly used in the real world? I think the one I come across most often would be CBC. Would anyone be able to share some stats (which I didn't manage to get to), or make and educated quess?