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Technical Vocabularynoun · /ˌpenɪˈtreɪʃən ˈtestɪŋ/

penetration testing

In simple English

Penetration testing, often abbreviated as pen testing, is a critical component of cybersecurity strategy in modern tech companies. Unlike passive vulnerability scanning, penetration testing involves actually attempting to breach systems—with explicit permission—to discover security weaknesses that could be exploited in real attacks. Security professionals use various techniques and tools to simulate how a real attacker might compromise an application, network, or infrastructure. In tech workplaces, penetration testing is conducted before major releases, after significant code changes, or on a regular scheduled basis to maintain security posture. Teams often hire external security firms to perform unbiased penetration tests, though some larger organizations maintain internal red teams for continuous testing. The results provide detailed reports on exploitable vulnerabilities, their severity, and recommended fixes—making it essential information for both security and development teams. The term is used frequently in security meetings, compliance discussions, and when planning release cycles. It carries significant weight in conversations about security budgets, risk management, and regulatory requirements like GDPR or PCI-DSS compliance.

Understanding what penetration testing is, how it works, and why companies conduct it to improve security.

At a glanceCEFR C1
Commonness4/5
Versatility4/5
FormalityCasualFormalFormal
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We need to schedule a penetration test before launch.
✓Our external pen testing team found three critical vulnerabilities.
✓Penetration testing revealed gaps in our authentication system.

Real examples

in a standup

"We completed penetration testing on the API last week and need to address the findings before Friday."

in a security meeting

"The penetration testing report shows we have inadequate session timeout controls on the admin panel."

in a team meeting

"We should budget for annual penetration testing to ensure our infrastructure stays secure."

Don't say this

Handle with care. Do not confuse with vulnerability scanning. Penetration testing is an authorized, simulated attack; scanning finds potential weaknesses. Also avoid using as a verb form like 'to penetration test'—use 'conduct penetration testing' or 'perform a penetration test' instead.

✕We need to penetration testing this application.
✓We need to conduct penetration testing on this application.— Penetration testing is a noun requiring a verb like conduct, perform, or run—not used directly as a verb.
✕Penetration testing and vulnerability scanning are the same thing.
✓Penetration testing simulates actual attacks, while vulnerability scanning identifies potential weaknesses passively.— These are distinct security practices with different scopes and methodologies.
✕We penetration tested the system yesterday.
✓We conducted penetration testing of the system yesterday.— The correct form uses the noun with a supporting verb, not a verb form of penetration testing.

Other forms

noun

penetration testing

"Penetration testing is required for compliance with payment card industry standards."

noun

penetration test

"Our annual penetration test will begin next month."

noun

pen test

"The pen test uncovered a critical SQL injection vulnerability."

Often used with

conduct penetration testingThe most common verb phrase; means to perform or carry out penetration testing
penetration testing reportThe documented findings and recommendations from a penetration test
authorized penetration testingEmphasizes that the testing has explicit permission from system owners
external penetration testingTesting performed by third-party security firms rather than internal teams
penetration testing findingsThe vulnerabilities and security issues discovered during testing

Similar words

pen testInformal, abbreviated form commonly used in tech conversations
security assessmentBroader term that may include penetration testing along with other evaluation methods
ethical hackingSimilar concept but emphasizes the ethical and authorized nature of the activity

Opposites

vulnerability scanningpassive reconnaissance

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your company wants to test security before the release. How do you phrase it?

Complete the sentence

2. Before we deploy to production, our security team will _______ to identify vulnerabilities.

Spot the mistake

3. Which sentence uses penetration testing incorrectly?

Rewrite naturally

4. Rewrite in professional tech English: 'We need to have someone attack our system legally to find problems before bad people do it.'

Questions

Quick poll

Have you said "penetration testing" in a standup this week?

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