what is the meaning of below line

Dear student,  The tautomeric forms are quite chemically distinct entities and can be separated (in suitable cases e.g. acetoacetic ester) and characterised. On the other hand, resonating forms differ only in the distribution of electrons and can never be separated from one another since neither of them has any real existence.thus we can say Tautomers are definite compounds and may be separated and isolated. Resonating structures are only imaginary and can’t be isolated. And therefore Tautomers are in dynamic equilibrium with each other, resonating structures are not in dynamic equilibrium. Regards,