  I present an overview of past, present and future research on microquasars
and jets, showing that microquasars, i.e. galactic jet sources, are among the
best laboratories for high energy phenomena and astroparticle physics. After
reminding the analogy with quasars, I focus on one of the best microquasar
representatives, probably the archetype, namely GRS 1915+105, and present
accretion and ejection phenomena, showing that only a multi-wavelength approach
allows a better understanding of phenomena occurring in these sources.
Thereafter, I review jets at different scales: compact jets, large-scale jets,
and the interactions between ejection and the surrounding medium. I finish this
review by showing that microquasars are good candidates to be emitters of
astroparticles: very high energy photons, cosmic rays and neutrinos.
