The TBT Agreement aims to ensure that technical regulations and standards do not create unnecessary obstacles to trade. It covers all products and allows countries to implement measures for legitimate objectives like protecting health and safety, but requires them to be non-discriminatory and not more trade-restrictive than necessary. Key principles include harmonizing with international standards where possible, providing transparency through notification and enquiry points, recognizing equivalency of other countries' conformity assessment procedures, and giving special treatment to developing countries.