This document discusses digital marketing models including the purchase funnel model and the AIDA model. The purchase funnel model illustrates the customer journey toward purchasing a good or service, from initial awareness to purchase. The AIDA model outlines the cognitive and affective stages customers progress through - from Attention, to Interest, to Desire, to Action. The document also briefly mentions the SOSTAC model and provides background on the author Hassan Imtiazi and his experience in digital marketing.