In the realm of software and app development, the terms "library" and "framework" are often used interchangeably, yet they have distinct roles and characteristics. A library consists of non-volatile resources like helper functions and pre-written code that developers can call upon to solve specific programming problems, granting them control over the implementation process. In contrast, a framework provides a broader structure for application development, encompassing pre-defined functions that call on the developer's code, thus controlling the workflow and many decisions in the development process. The main difference lies in the "inversion of control," where libraries allow developers to initiate actions, while frameworks dictate the flow by integrating the developer's code into its system. As such, frameworks are more opinionated and less modifiable compared to libraries, which require additional code adjustments during development.