Altitude or elevation means the height above sea level of a location. Altimetry of relief refers to the measure of altitude on the Earth's surface.
An altimeter indicates the differences in altitude on the Earth's surface.
Altitude can be represented on topographic maps by curved lines, imaginary lines that connect geographical points of equal altitude, or by colors, each color meaning a different altitude.
Let's see this image and interpret what it says.
Besides, topographic profiles give us a cross-sectional view of relief in a graph.
Let's do an experiment to understand curved lines. We'll need a potato.
Now, with the following steps, you will draw a topographic profile. (Thanks to Arq. Maria Parra)