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What is DDoS (Distributed Denial of Service)?

An attack that floods a target server or network with traffic from multiple sources to overwhelm it and deny service to legitimate users.

DDoS attacks use thousands of compromised devices (botnets) to generate massive traffic volumes. Types include volumetric attacks (flood bandwidth), protocol attacks (exploit protocol weaknesses), and application layer attacks (target specific services).

Mitigation includes CDN/DDoS protection services (Cloudflare, AWS Shield), rate limiting, geo-blocking, traffic analysis, and over-provisioning. DDoS attacks are common and can target any internet-facing service. Protection should be part of every production architecture.

Related Terms

Zero Trust
A security model that requires strict identity verification for every user and device, regardless of their network location.
Brute Force Attack
An attack method that systematically tries all possible combinations of passwords or keys until the correct one is found.
API Security
Practices and mechanisms for protecting APIs from unauthorized access, data breaches, and abuse.
SQL Injection
An attack where malicious SQL code is inserted into application queries through user input to access or manipulate the database.
Two-Factor Authentication (2FA)
A security method requiring two different forms of identification before granting access to an account.
CORS (Cross-Origin Resource Sharing)
A browser security mechanism that controls which web domains can access resources from another domain via HTTP requests.
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