In Spanish, all nouns are either masculine or feminine. Often, nouns end in -o they’re masculine and -a if they’re are feminine

el niño – the boy
la niña – the girl

Notice how you use el if the word is masculine and la if the word is feminine.

The aplle is a girl?!

It’s not just people that are masculine or feminine in Spanish. Objects are, too!

el pan – the bread
la manzana – the apple

Not sure what gender something is? Look at the the! If a word uses el, it’s masculine. If it uses la, it’s feminine.