> I'm not sure the technical meaning of entropy in this context
Roughly, it's the logarithm (base 2) of the number of guesses that an optimal password guesser would have to guess in order to guess your password. It's a measure of how unknown your password is.
> it has so many possible combinations, that every speaker is continually creating sentences that have never before been uttered.
Yes, this is why all of the suggested alternatives like "choose a line from a popular song" are so much less secure.
Roughly, it's the logarithm (base 2) of the number of guesses that an optimal password guesser would have to guess in order to guess your password. It's a measure of how unknown your password is.
> it has so many possible combinations, that every speaker is continually creating sentences that have never before been uttered.
Yes, this is why all of the suggested alternatives like "choose a line from a popular song" are so much less secure.