There are various reasons why websites get hacked. Here are some of the top reasons:

1. Weak Passwords: Weak passwords are the most common reason why websites get hacked. Hackers use automated tools to guess passwords and gain access to websites.

2. Outdated Software: Outdated software, plugins, or themes can have vulnerabilities that hackers can exploit to gain access to a website.

3. SQL Injection: SQL injection is a technique where hackers inject malicious code into a website's database, allowing them to gain access to sensitive information.

4. Cross-site Scripting (XSS): XSS is a type of security vulnerability that allows hackers to inject malicious code into a website, which can then be executed on users' browsers.

5. Insufficient Authentication: If a website has insufficient authentication mechanisms, it may allow attackers to bypass login pages and gain access to sensitive data.

6. File Inclusion: File inclusion is a technique used by hackers to exploit vulnerabilities in a website's code, allowing them to include and execute malicious files on the website.

7. Insecure File Uploads: If a website allows users to upload files without proper security measures, hackers can upload malicious files that can be executed on the server.

8. Social Engineering: Social engineering is the use of deception to trick people into revealing sensitive information or performing actions that they shouldn't. Hackers may use social engineering techniques to gain access to a website's sensitive information.

To prevent your website from being hacked, it's essential to keep your software and plugins up-to-date, use strong passwords, and implement proper authentication and security measures.