It's the masculine singular form of the word "regalo," which means "gift."
Here are some examples of how "el regalo" can be used:
* "Le di un regalo a mi madre." (I gave my mother a gift.)
* "¿Qué te gustaría como regalo de cumpleaños?" (What would you like as a birthday gift?)
* "El regalo está envuelto en papel de regalo." (The gift is wrapped in wrapping paper.)