Focuses on the prohibition of Geneivas Da’as and Ta'us Akum. Geneivas Da’as is defined literally as causing one to have a mistaken assumption. We will discuss the various opinions of the source of this prohibition, and its practical applications across business and interpersonal relationships, and other areas where one may be deceived. Additionally, we will discuss the topic of Ta'us Akum and how it is related to the general issur of Geneivas Da’as.