1. [[Indicated Altitude]]: altitude you read directly off your altimeter 2. [[Pressure Altitude]]: altimeter reading when you set it to 29.92 inches Hg 3. [[Density Altitude]]: pressure altitude corrected for non-standard temperature 4. [[True Altitude]]: vertical distance of your airplane above sea level, commonly expressed as "feet [[MSL]]" 5. [[Absolute Altitude]]: Constantly changing, absolute altitude is the distance measurement of your airplane above the ground, expressed in "feet [[AGL]]" (above ground level)^[This is also what [[radar altimeter|radar altimeters]] measure] ***Source***: [The 5 Types Of Altitude, Explained](https://www.boldmethod.com/blog/lists/2022/10/the-five-types-of-flying-altitudes-explained/) from [[Bold Method]]