computer software created to allow the user to perform a specific job or task  three categories  * general purpose application  * specialized apps  * mobile apps
end user of software that is used to accomplish a variety of tasks. 1. general purpose applications. 2. specialized applications.  3. mobile apps.
Abplanalp used plastic in a model that could be mass-produced, lowering the price per valve from 15 cents to 2 1/2 cents.