FC0-U71 Applications and Software Practice Question
Which of the following best describes the function of a web API?
⚠ Common exam trap
The trap is conflating the API with the transport security (TLS) or the user interface—candidates often pick 'encrypts data' because APIs are commonly accessed over HTTPS, but encryption is a separate layer from the API's core function of enabling application-to-application communication.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It allows different software applications to communicate and exchange data.
A web API (Application Programming Interface) is a set of defined endpoints, protocols, and data formats that allow different software applications to communicate and exchange data over HTTP/HTTPS. It abstracts backend logic so clients (web apps, mobile apps, third-party services) can request and submit data without knowing internal implementation details. Common examples include REST APIs using JSON and SOAP APIs using XML.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It encrypts data transmitted between a web browser and server.
Why it's wrong here
Encryption of browser-to-server traffic is provided by TLS/HTTPS, not by an API. It is tempting because APIs commonly run over HTTPS, but their actual purpose is exposing defined endpoints so applications can request and exchange data programmatically.
- ✗
It is a programming language used to query databases.
Why it's wrong here
A web API is not a programming language; query languages such as SQL serve that role. It is tempting because APIs often wrap database access, but their actual purpose is exposing callable endpoints over HTTP so applications can exchange data or invoke functionality.
- ✗
It provides a graphical user interface for web applications.
Why it's wrong here
A graphical user interface is rendered by front-end code for humans; an API exposes machine-readable endpoints without visual presentation. It is tempting because both sit in web applications, but the API's actual purpose is programmatic data exchange between software components.
- ✓
It allows different software applications to communicate and exchange data.
Why this is correct
A web API exposes defined endpoints over HTTP so separate applications can request and exchange data regardless of language or platform, satisfying the requirement to describe its core function. It is not a database, browser, or storage service.
Go deeper
Related to this question
About these practice questions
This FC0-U71 question is part of Courseiva's 988-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.