What type of attack seeks to make a service unavailable to users?

A Distributed Denial of Service (DDoS) attack is designed specifically to make a service unavailable to its intended users. This is achieved by overwhelming the targeted service, such as a website or network, with a flood of traffic from multiple sources, rendering it unable to respond to legitimate requests. The primary goal of a DDoS attack is to disrupt operations, leading to downtime and loss of access or functionality for users.

In contrast, phishing attacks are aimed at tricking individuals into revealing sensitive information such as usernames, passwords, or credit card numbers. SQL injection attacks target databases, exploiting vulnerabilities in an application's software to execute malicious SQL code. Cross-site scripting (XSS) attacks involve injecting malicious scripts into web pages viewed by users, which typically aims to steal information rather than disable a service. Each of these other attack types has different objectives and methods, distinctly separating them from the purpose of a DDoS attack.