  Relativistic jets are collimated plasma outflows with relativistic speeds.
Astrophysical objects involving relativistic jets are a system comprising a
compact object such as a black hole, surrounded by rotating accretion flows,
with the relativistic jets produced near the central compact object. The most
accepted models explaining the origin of relativistic jets involve
magnetohydrodynamic (MHD) processes. Over the past few decades, many general
relativistic MHD (GRMHD) codes have been developed and applied to model
relativistic jet formation in various conditions. This short review provides an
overview of the recent progress of GRMHD simulations in generating relativistic
jets and their modeling for observations.
