Abstract
This review summarizes and critically reviews measurements of charged-particle multiplicity distributions and pseudorapidity densities in 
collisions between 
and 
. Related theoretical concepts are briefly introduced. Moments of multiplicity distributions are presented as a function of 
. Feynman scaling, KNO scaling as well as the description of multiplicity distributions with a single negative binomial distribution and with combinations of two or more negative binomial distributions is discussed. Moreover, similarities between the energy dependence of charged-particle multiplicities in 
and e+e− collisions are studied. Finally, various predictions for pseudorapidity densities, average multiplicities in full phase space and multiplicity distributions of charged particles in 
collisions at the LHC energies of 
and 14 TeV are summarized and compared.
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