Error, Defect (Bug), and Failure in Software Testing

 In software development, the terms error, defect/Bug, and failure are generally used together. Many people suppose these words mean the same thing, but actually they are different. Let’s understand them in simple words.

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1. Error

An error is a human mistake made during the software development process. It happens when a developer, tester, or analyst does something wrong.

This could be:

• Misunderstanding a requirement
• Writing incorrect logic
• Using a wrong formula
• Making a typing mistake in the code

In simple words, an error is an incorrect human action.

For example, if a developer writes the wrong calculation formula in a banking application, that is an error.

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2. Defect (Bug)

A defect (also called a bug) is the result of an error found in the software. When the code with an error is tested, and it does not behave as expected, the tester identifies and reports it as a defect.

In short:
An error is made by a human → when it is found in the software, it becomes a defect.

For example, if the banking application calculates interest incorrectly because of a wrong formula, the tester will report it as a defect.

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3. Failure

A failure happens when the software does not perform as expected in real use. This usually occurs when a defect is not fixed and the software is released to customers.

In simple words, failure is when the system actually breaks or gives wrong output while running.

For example, if customers see wrong interest calculations in the live banking system, that is a failure.

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Relationship Between Error, Defect, and Failure

The connection between them is very simple:

Error (human mistake) → Defect (problem in software) → Failure (problem experienced by user)

 

 

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How to Get a Job in Software Testing (India) – Resume + Interview Tips (2026 Guide)

Software testing is one of the most in-demand IT jobs (careers) in India. Over the last few years, in India, a lots of startup IT companies have started hiring more software testing engineers as businesses move online.

If you're a fresher, career switcher, or IT graduate, this guide will help you understand:

✅ How to start a career in software testing.

✅ What skills and abilities do you require

✅ How to create a good resume

✅ How to prepare for interviews/job

✅ How to actually hired in India

1️. Understand the Types of Software Testing Jobs

Before applying, you must know the different roles available:

🔹 Manual Testing

• Writing test cases
• Executing test cases
• Reporting bugs
• Understanding SDLC & STLC

Best for beginners and freshers.

🔹 Automation Testing

• Writing scripts using tools like Selenium
• Using programming languages (Java, Python)
• Working with frameworks (TestNG, JUnit)

High demand + higher salary growth.

🔹 Other Testing Roles

• API Testing (Postman, Rest Assured)
• Performance Testing (JMeter)
• Mobile Testing (Appium)
• Security Testing

👉 Tip: Start with Manual Testing basics and then move to Automation for better growth.

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2️. Skills Required to Get a Software Testing Job in India

Here’s what companies usually expect:

🧠 Technical Skills

• SDLC & STLC concepts
• Test Case writing
• Bug Lifecycle
• Basic SQL Queries
• Basic knowledge of Selenium (for automation)
• API Testing basics

💬 Soft Skills

• Good communication
• Logical thinking
• Attention to detail
• Analytical mindset

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3️. How to Create a Strong Software Testing Resume (For Freshers)

Your resume should be:

✔️ 1–2 pages maximum
✔️ Clear and professional
✔️ No spelling mistakes

📄 Resume Structure

1. Professional Summary (3–4 lines)
Example:

Detail-oriented Software Testing fresher with strong knowledge of Manual Testing, STLC, and Bug Reporting. Familiar with Selenium and SQL basics. Looking for an entry-level QA role.

2. Technical Skills Section

• Manual Testing
• Selenium (Basic)
• SQL
• Test Case Design
• Bug Tracking Tools (JIRA, Bugzilla)

3. Academic Project
Mention:

• Project name
• Your role
• What testing you performed
• Tools used

Example:

Performed functional and regression testing for an E-commerce website project. Wrote 50+ test cases and reported bugs using JIRA.

4. Certifications (Optional but Helpful)

• Software Testing Course
• Selenium Training

👉 Important: Add real-time project experience (even if it’s self-practice project).

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4️. Resume Tips That Increase Selection Chances

• Use keywords like: Manual Testing, Selenium, SQL, STLC
• Keep formatting clean
• Don’t copy resume from friends
• Customize resume according to job description
• Use action words: “Executed”, “Designed”, “Analyzed”, “Reported”

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5️. How to Prepare for Software Testing Interview (India)

📌 Common Manual Testing Interview Questions

1. What is SDLC and STLC?
2. What is the difference between Verification and Validation?
3. What is Regression Testing?
4. Explain Bug Life Cycle.
5. How do you write a test case?

👉 Practice answering clearly with examples.

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📌 Common Automation Testing Questions

1. What is Selenium?
2. Difference between findElement and findElements?
3. What is TestNG?
4. What are different types of waits in Selenium?
5. Explain Page Object Model (POM).

👉 If you don’t know coding deeply, at least understand concepts.

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6️. How to Actually Get a Job in Software Testing (Step-by-Step)

Step 1: Learn Basics (1–2 months)

• Manual Testing
• SQL basics
• Basic Selenium

Step 2: Practice Daily

• Create dummy projects
• Write test cases
• Practice interview questions

Step 3: Create LinkedIn Profile

• Add skills
• Connect with HRs
• Post about your learning

Step 4: Apply Smartly

Apply on:

• Naukri
• LinkedIn
• Indeed
• Company career pages

Don’t just apply — message recruiters politely.

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7️. Salary Expectations in India (2026)

• Fresher (Manual Testing): ₹2.5–4 LPA
• Automation Tester (1–3 years): ₹4–8 LPA
• Senior QA: ₹10+ LPA

Salary depends on skills, location, and company.

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8️. Common Mistakes to Avoid

❌ Only theory knowledge
❌ No practical project
❌ Poor communication
❌ Copy-paste resume
❌ Not practicing mock interviews

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9️. Final Advice for Freshers

• Don’t wait for “perfect preparation”
• Start applying early
• Keep improving skills
• Focus on Automation after basics
• Stay consistent

Software Testing is a stable and growing career in India. With the right skills and preparation, you can land your first QA job within 3–6 months.

 

 

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