The word "tajweed" means to improve, make better.

Tajweed of the Holy Qur'an is the knowledge and application of the rules of recitation so the reading of the Qur'an is as the Prophet Mohammed peace and blessings be upon him, recited.

This site explains some of the principles of tajweed and focuses on the problems that non-Arabs have in reciting the Qur'an properly.  Tajweed tidbit (titbit) lessons will be given in different aspects of tajweed