What is a defect in software?

A defect in software is a discrepancy between the actual behavior of the program and the expected result described in the requirements or specifications.

In simpler terms, it is a bug that causes the program to operate differently than intended.

The causes of defects can vary:

Bugs in the code.
Incorrect or incomplete requirements specification.
Misunderstanding of requirements by the developer or tester.
Design errors in architecture.
Integration issues among different components.
Insufficient testing.
Human factors.

The defect lifecycle typically includes the following stages:

Discovery: The tester or user finds the problem.
Logging: The defect is described in a bug tracking system (e.g., Jira, Bugzilla) with steps to reproduce, actual and expected results, priority, and severity.
Analysis: The developer analyzes the defect, confirms its presence, and determines the cause.
Fix: The developer makes changes to the code to eliminate the defect.
Verification: The tester rechecks the fixed defect to ensure it is resolved and no new issues (regression) have appeared.
Closing: If the defect is successfully fixed and verified, it is closed.

Important attributes of a defect during registration:

ID (unique identifier)
Summary
Detailed description and steps to reproduce
Actual Result
Expected Result
Severity: How much the defect affects functionality or usability.
Priority: How quickly the defect needs to be fixed.
Environment: Platform, OS, browser, etc., where the defect was found.
Attachments: Screenshots, logs, videos.
Status: New, Open, In Progress, Fixed, Closed, etc.
Assignee: Developer responsible for fixing.

Example of steps to reproduce:

// Steps to reproduce:
// 1. Open the website at [URL]
// 2. Navigate to the registration page.
// 3. Enter valid data in all fields except the "Email" field.
// 4. Enter an incorrect format in the "Email" field (e.g., "test@").
// 5. Click the "Register" button.

Example of actual and expected results:

// Actual Result:
// The user is redirected to the main page without an error message.
//
// Expected Result:
// An email format validation error message should appear, and registration should not be completed.