  In the last few decades, gravastars have been proposed as an alternative to
black holes. The stability of the gravastar has been studied in many modified
theories of gravity along with Einstein's GR. The $f(Q,T)$ gravity, a
successfully modified theory of gravity for describing the current accelerated
expansion of the Universe, has been used in this article to study gravastar in
different aspects. According to Mazur and Mottola (Proc. Natl. Acad. Sci 101,
9545 (2004)), it has three regions with three different equations of state.
Here in this work, we have studied the interior of the gravastar by considering
the $p=-\rho$ EoS to describe the dark sector for the interior region. The next
region is a thin shell of ultrarelativistic stiff fluid, in which we have
investigated several physical properties, viz., the proper length, energy,
entropy, surface energy density, etc. In addition, we have studied the surface
redshift and speed of sound to check the potential stability of our proposed
thin-shell gravastar model. Apart from that, we have used the entropy
maximization technique to verify the stability of the gravastar model. The
gravastar's outer region is a complete vacuum described by exterior
Schwarzschild geometry. Finally, we have presented a stable gravastar model
which is singularity-free and devoid of any incompleteness in classical black
hole theory.
