Yes. That's a nice, simple, intuitive description of the process that
liberates energy in the cores of stars and "H" bombs.
When 2 Hydrogen nuclei combine to form 1 Helium nucleus,
the combined nucleus has about 0.7% less mass than the
Hydrogen nuclei had. That "missing mass" shows up in the
form of energy leaving the site of the fusion.
Can you say "big boom" ?
