  Data on the hadronic final state of deep-inelastic events at the ep collider
HERA are reviewed. Fragmentation properties in the current region extracted
from charged particle spectra are compared to e+e- and fixed target experiments
at lower center of mass energies. A measurement of the strong coupling constant
from integrated jet rates is presented and prospects to extract the gluon
density in the proton by tagging vector mesons are discussed. Data on the
inclusive mean transverse energy together with the transverse momentum
distribution of single charged particles indicate an increased gluon activity
in the central rapidity region when the phase space is enlarged. The
measurement of the forward jet cross-section is discussed. Keeping the phase
space fixed, the mean transverse energy and the mean charged multiplicity for
certain rapidity ranges is found to behave analogously to ppbar collisions.
