Note that advertisements are clearly marked with the Ad next to the websites name and appears above organic (non-paid results). However, just because paid advertising appears above organic results does not necessarily mean that users will click them.
A study conducted by The Marketing Science Institute found that consumers researching products tend to click on organic results first with a mixture of both paid and organic when they are ready to make a purchase.
Therefore it is vital to keep all options open when choosing a digital marketing medium and use a mix of strategies when possible. Ideally SEO and PPC should be used in combination in order to get maximum exposure. However, if a business is just starting out then PPC delivers a quicker return on investment (ROI) as opposed to SEO which can take 6-8 months to start getting results.
Similar to search results Google Shopping also displays advertisements in the search results. It also have its own section where consumers can filter products based on certain criteria such as availability, brand and price. Google Shopping ads have a more involved setup which includes creating a feed conforming to Googles specifications such as a unique identifier, price, image, product title and Google category.
This is known as display advertising. Generally website owners rent their page to vendors such as Google. This allows you to advertise on their website or choose to follow a certain type of customer.
It falls under a type of digital marketing strategy known as remarketing.
Remarketing is a digital marketing tactic that conserves ad spend and increases relevance by continuously engaging with prospects that have already interacted with your brand.