Every developer working with Apache Ant should be familiar with its core tasks that form the backbone of build automation. The <javac> task is essential for compiling Java source files, while <jar> helps package compiled classes into JAR files for distribution. The <copy> and <delete> tasks handle file management, allowing developers to move or clean up resources efficiently. <mkdir> ensures necessary directories exist before operations, and <echo> provides logging and debugging information during builds. For automation and testing, <junit> integrates unit testing directly into the build process. <zip> and <untar> are valuable for archiving and extracting files, and <exec> allows execution of system commands within the build script. Together, these tasks empower developers to create flexible, automated, and reproducible build workflows across different environments.