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ELI5: Why is the sun hot?

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The Sun constitutes a self-gravitating, quasi-spherical assemblage of ionized baryonic constituents whose internal pressure gradients asymptotically counterbalance the inward-directed gravitational acceleration imposed by its own mass distribution.
As a consequence of this hydrostatic equilibrium, the solar core experiences extreme thermodynamic compression, producing temperatures on the order of 1.5×10^7 kelvin.
At these temperatures, hydrogen nuclei—predominantly protonic entities possessing positive electric charge—exhibit a sufficiently elevated kinetic-energy distribution to facilitate nuclear interactions despite the formidable electrostatic repulsion associated with their Coulombic mutual exclusion.

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