Abstract
The HERMES experiment has studied for more than a decade deep-inelastic scattering of electrons/positrons from longitudinally and transversely pol arised and also unpolarised atomic gas targets internal to the electron storage ring of HERA. The collected semi-inclusive data allowed to extract informations about various quark distribution a nd fragmentation functions. Examples presented in this contribution are: a novel determination o f the unpolarised strange-quark (plus anti-quark) distribution; the measurement of single-spin azimuthal asymmetries for pions and kaons from a transversely polarised hydrogen target that are related to the quark transversity distribution in conjunction with the spin-dependent Collins fragmentation function and also to the Sivers distribution function; and the measurement of azimuthal hadron asymmetries in unpolarised deep-inelastic scattering related to the so-calle d Cahn effect and the Boer-Muldersdistribution function.
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