The term "90%" represents a proportion or percentage that indicates nine parts out of ten. It is commonly used in various contexts, such as statistics, finance, and education, to show a significant majority or a high level of achievement. For example, if a student scores 90% on a test, it means they answered 90 out of 100 questions correctly. In everyday life, "90%" can also refer to completion or satisfaction levels. For instance, if a project is said to be 90% complete, it suggests that only a small portion of the work remains. This concept helps people gauge progress and make informed decisions in various situations.