Short answer
Phishing and spam differ mainly in intent: phishing aims to deceive recipients into giving up personal data or installing malware, while spam is simply unsolicited bulk messaging, regardless of its content. However, phishing attempts can be delivered as spam messages. 1 2
Phishing can be a subtype of spam when deceptive messages are sent in bulk, but not all spam is phishing.
On this page
At a glance
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| Question | Phishing | Spam |
|---|---|---|
| Feature | phishing | spam |
| Primary intent | Deception to steal data or infect | Unsolicited bulk messaging |
| Typical content | Fake requests, harmful links | Advertisements, promotions |
What each thing is
Phishing. Phishing is a form of deception where criminals attempt to trick individuals into revealing sensitive information or installing malicious software, often by sending messages that appear trustworthy but are actually harmful. 1
Spam. Spam refers to unsolicited bulk messages, typically sent electronically, that flood users with unwanted content without necessarily containing malicious intent or deception. 2
Key differences
The technical axis that separates phishing from spam is intent: phishing messages are crafted to trick recipients into revealing sensitive information or installing malware, while spam is defined by its unsolicited and bulk nature, regardless of the message’s purpose. 1 2
How to tell them apart
A practical way to tell them apart is to look for signs of deception or requests for sensitive information. If a message tries to impersonate a trusted entity or asks for credentials, it’s likely phishing. If it’s just unwanted advertising, it’s spam. Some messages can be both. 1 2
Where they overlap
Phishing attacks are often distributed using spam techniques, meaning a phishing message can arrive as part of a mass unsolicited email campaign. In these cases, the message is both spam and phishing, blending bulk delivery with deception. 1 2
Edge cases
Some spam messages may contain links to promotional sites that appear suspicious but do not actually attempt to steal information or install malware. These can be mistaken for phishing, but unless deception is present, they remain spam. 1 2
Why the distinction exists
The distinction exists because not all unwanted messages are dangerous; spam became a recognized problem due to the volume of unsolicited messages, while phishing emerged as a specific threat due to its use of deception for criminal gain. 1 2
Common misconceptions
A common misconception is that all spam is dangerous or malicious. In reality, most spam is simply unwanted advertising, while phishing specifically aims to harm or deceive the recipient. 1 2
Examples
If you receive a bulk email promoting a sale, it’s spam. If you get a message that looks like it’s from your bank asking you to verify your password, especially if sent to many people, it’s both phishing and spam. 1 2
Sources
Sources checked October 3, 2026.
- CISA — Recognize and report phishing. Phishing examples and channels.
- NIST CSRC — Spam. Spam definition.