Explanation:

- Technology: The most appropriate term. It refers to the application of scientific knowledge for practical purposes. This can include the creation of tools, machines, and other inventions that improve our efficiency or capability.

- Technicality: This refers to the detailed or subtle aspects of a subject or process. It doesn't strictly involve the use of scientific knowledge for practical purposes.

- Discovery: This means finding out or uncovering something previously unknown. While discoveries can lead to technological advances, the term itself does not imply the application of scientific knowledge.

- Engineering: This involves designing and building, often using scientific principles, but it's more specific to creating and constructing rather than applying knowledge in a broader sense like technology.