  Since the first observations of solar oscillations in 1962, helioseismology
has probably been one of the most successful fields of astrophysics. Besides
the improvement of observational data, solar seismologists developed
sophisticated techniques to infer the internal structure of the Sun. Back in
1990s these comparisons showed a very high agreement between solar models and
the Sun. However, the downward revision of the CNO surface abundances in the
Sun in 2005, confirmed in 2009, induced a drastic reduction of this agreement
leading to the so-called solar modelling problem. More than ten years later, in
the era of the space-based photometry missions which have established
asteroseismology of solar-like stars as a standard approach to obtain their
masses, radii and ages, the solar modelling problem still awaits a solution. We
will briefly present the results of new helioseismic inversions, discuss the
current uncertainties of solar models and possible solutions to the solar
modelling problem. We will also discuss how the solar problem can have
significant implications for asteroseismology as a whole by discussing the
modelling of the exoplanet-host star Kepler-444, thus impacting the fields
requiring a precise and accurate knowledge of stellar masses, radii and ages,
such as Galactic archaeology and exoplanetology.
