GNU Octave is a computer program that helps people do math! It is like having a calculator that can do super complicated math problems. It can help you solve equations like 2+3=5, but it can also solve much harder problems like 3x+5y=20.
Octave is really good at doing math with numbers that have a lot of decimals, and it can handle really big numbers too! It can even do math with things like matrices, which are like boxes filled with numbers. Octave can also make graphs and charts to help understand the math results.
Octave is an open-source program, which means lots of people from all over the world work on it and make it better. This makes it really useful for lots of different things, like engineering, physics, and even making music!
So if you ever need help doing complicated math problems or making cool graphs and charts, you can use GNU Octave to help you!