What is a description of insertion?

"Insertion" can have multiple meanings depending on the context. Please provide more information so I can give you a more specific description. For example, are you asking about:

* Insertion in programming? This refers to adding data into a specific position within a data structure, such as an array or a string.

* Insertion in biology? This refers to the process of inserting genetic material (DNA) into a cell or organism.

* Insertion in surgery? This refers to the process of putting something into the body, such as a catheter or a stent.

Once you provide me with more context, I can give you a more accurate and helpful description of "insertion."