This article uses too much jargon, which needs explaining or simplifying. (November 2018)
Dynamite is an explosive invented by Alfred Nobel. Its main explosive component is nitroglycerin. Nitroglycerin is very sensitive to movement. It explodes very easily, when moved. For this reason, it is absorbed into diatomaceous earth to make is less sensitive. Diatomaceous earth is a soft, sedimentary rock made of fossil diatoms. In dynamite, about one part of four is diatomaceous earth, the other three are nitroglycerin. A little sodium carbonate is added to stabilise the mixture.
Even though the diatomaceous earth takes away some of the dangers of nitroglycerin, there are still problems because the mixture is not stable in damp environments. Water causes the nitroglycerin to leak away. The nitroglycerin can build up, and explode unexpectedly.
Today, dynamite is not much used. It has been replaced by explosives based on ammonium nitrate which use gelignite. These explosives cost less to make, and are easier to handle than dynamite. However, works of fiction still show people using dynamite.