To enhance the security of a WordPress installation, it is advisable to change the default table prefix. This can be achieved by modifying the '$table_prefix' value in the wp-config.php file before the installation process begins. By altering the table prefix, you make it more challenging for potential attackers to target your database tables, as the default 'wp_' prefix is commonly known and exploited. Changing the prefix adds an extra layer of protection against SQL injection and other malicious attacks. It is crucial to perform this step during installation to avoid any potential conflicts with existing tables in the database. By proactively customizing the table prefix, you significantly bolster your WordPress site's security posture, ensuring a safer environment for your valuable content and user data.