An abandoned cart refers to a situation where a potential customer adds items to their online shopping cart but leaves the website without completing the purchase. This can happen for various reasons, such as distractions, indecisiveness, technical issues, or unexpected costs. As an internet marketer and SEO specialist, it is crucial to address and minimize abandoned carts through strategies like optimizing the checkout process, offering incentives, and implementing remarketing campaigns to encourage customers to return and complete their purchase.