Okay kiddo, imagine there's a big imaginary line that goes all around the world, like a belt. This line is called the equator and it's like the middle of the earth.
Now imagine there's another imaginary line that goes around the earth, but it's a bit further down from the equator. This line is called the 35th parallel south.
The 35th parallel south is just a way for people to talk about a specific spot on the earth. It's like saying you live on 123 Main Street. That's just an easy way for people to know where your house is.
If you were standing on the 35th parallel south, you'd be in the southern hemisphere, which is below the equator. You might be in a country like Australia or Chile. That's all there is to it, buddy!