Jira uses a proprietary query language called Jira Query Language (JQL) for searching issues. JQL provides a powerful and flexible way to define complex search criteria that go beyond the basic search functionality. Users can construct queries using fields (e.g., project, status, assignee), operators (e.g., =, !=, IN), and keywords (e.g., AND, OR). This allows engineers like Kevin to precisely filter and find issues related to specific builds, deployments, or statuses directly within Jira.

A. Java Query Language (JPQL) is used for database queries in Java Persistence API (JPA) applications and is unrelated to searching within the Jira user interface.

B. Structured Query Language (SQL) is used for managing data in relational databases. While Jira has a database backend, JQL is the abstracted language provided to users for searching.

C. "Atlassian Query Language" is not the official name. While Atlassian develops Jira, the specific language for this product is officially named Jira Query Language (JQL).

1. Atlassian. "What is JQL?". Jira Software Cloud documentation. Atlassian. "Jira Query Language (JQL) is the most powerful and flexible way to search for your issues in Jira." (Source: https://support.atlassian.com/jira-software-cloud/docs/what-is-jql/).

2. Atlassian. "Advanced searching". Jira Software Cloud documentation. Atlassian. This guide provides a complete reference for JQL syntax, fields, operators, and keywords. The entire document refers to the language as JQL or Jira Query Language. (Source: https://support.atlassian.com/jira-software-cloud/docs/advanced-searching/).