Which type of attack attempts to overwhelm a system with requests?

A DoS (Denial of Service) attack is characterized by an attempt to make a machine or network resource unavailable to its intended users by overwhelming it with a flood of illegitimate requests. The primary goal is to exhaust the resources of the target system, such as bandwidth, memory, or processing power, ultimately leading to a denial of service for legitimate requests. This type of attack exploits the system's limitations and can cause significant disruption, making it inaccessible for users who need it.

In contrast, phishing attacks focus on tricking individuals into providing sensitive information, while man-in-the-middle attacks involve intercepting communication between two parties without their knowledge. SQL injection attacks target databases by injecting malicious SQL code to manipulate data. Each of these other attack types focuses on different vulnerabilities and does not primarily rely on overwhelming a system with requests.