In other words, function is about how well something works, while aesthetic is about how pleasing something is to the eye.
For example, a chair that is both comfortable to sit in (function) and pleasing to look at (aesthetic) would be considered a good chair.
Similarly, a car that is fuel-efficient (function) and stylish (aesthetic) would be considered a good car.
In some cases, function and aesthetic can be at odds with each other. For example, a car that is very fuel-efficient may not be very stylish, and a chair that is very comfortable to sit in may not be very pleasing to look at.
However, in many cases, it is possible to find a balance between function and aesthetic. For example, there are many cars that are both fuel-efficient and stylish, and there are many chairs that are both comfortable to sit in and pleasing to look at.
Ultimately, the best balance between function and aesthetic is a matter of personal preference.