Juno was married to Jupiter. She was the queen of all the gods, and also the goddess of marriage.
In Greek myth, Hera often behaves as a dangerously jealous, petty queen of the heavens, who is not nice at all, and spends a great deal of her time getting even, whether the slights are imagined or real.
But in Roman mythology, Juno was the beloved goddess of marriage, worshipped as a housewife and mother and matron. Although Juno watched over all Roman women, her special concern was Roman married women.
Juno's temples were mostly in Rome. Every March 1st, there was a big festival in ancient Rome, to honor Juno. It was a very serious affair. Roman women counted on Juno to watch out for them.
Although the Romans enjoyed the Greek myths about Queen Hera, they treated some of these myths with a "not much truth in them really, but aren't they fun" kind of attitude.
Still, even the best of wives get jealous now and then. Some of the Greek tales did wander their way into Roman mythology. But with the retelling of this ancient Greek myth, the Romans did more than change the names of the gods. They gave the story the personalities of the Roman gods, especially the personality of Juno.