Saint Nic
In short
Saint Nic is a popular nickname for Saint Nicholas, a fourth-century Christian bishop known for his generosity and gift-giving.
In plain words
He was a real person who lived a long time ago. People remember him because he helped people in secret. This helped start the tradition of giving presents at Christmas.
A simple example
A person might leave a small toy or a sweet treat under a child's pillow overnight to surprise them.
Why it matters
He is the historical figure behind Santa Claus. His stories encourage people to be kind and helpful to others without seeking praise.
Easy to mix up
Do not confuse him with Father Christmas, who is the personification of the holiday spirit rather than the specific historical saint.