Internationalization (i18n) is the process of designing software to be used in different locales, or languages and regions. Java Servlets can be internationalized using a combination of Java's built-in localization features and web technologies such as HTML, CSS, and JavaScript.

Here are some key steps to internationalizing a Java Servlet:

1. Define your resources: Identify the text and images that need to be translated in your servlet. This includes static content in your JSPs or HTML pages, as well as dynamic content generated by your servlet code.

2. Use resource bundles: Java's resource bundle API allows you to store and retrieve localized content in a structured way. Create a resource bundle for each locale, and use the appropriate bundle to display the correct content to the user.

3. Use localization tags in JSPs: JSPs provide a mechanism for including localized content using tags such as <fmt:message> and <fmt:setLocale>. These tags allow you to display messages in the user's preferred language and format dates and numbers according to the user's locale.

4. Use CSS and JavaScript to handle layout and formatting: Depending on the languages and regions you're supporting, you may need to adjust the layout and formatting of your web pages to accommodate different text lengths and character sets. Use CSS and JavaScript to handle these adjustments.

5. Test your servlet with different locales: Use a tool like the Locale Emulator or BrowserStack to test your servlet with different locales and character sets. Verify that all text is translated correctly and that the layout and formatting look good in all supported languages.

By following these steps, you can create a servlet that is ready to be used by users around the world, regardless of their language or region.