A brief analysis of Google content-related ads

Just as MS has mastered the operating system market and what it will do, Google is also float when the search engine's red flag does not fall. Over the past six years, Google has always given everyone a very professional impression. As long as Google is involved, it must be the strongest in this field.
It is said that Google's content-related ads have also been around for many years, but it is not long before it came into my sight. Last year, some media reported that Google put ads on the search results, featuring text ads, which are closely related to search keywords.
A traditional website advertisement model may be like this:
An online store selling "digital cameras" places advertisements on a website with high traffic. For example, an advertisement is shown 10 thousand times a day, but how many people notice the advertisement in the 10 thousand display? It may be 1/10. How many people are aware of the purchase intention? It may be 1/10. Therefore, the last valid display may only be 10 times.
Google's advertising model is like this:
An online store selling "digital cameras" registers an advertisement on Google. However, not everyone accesses Google ads. Only when someone searches for "digital cameras" on Google will the ads for the "digital cameras" online store appear. For example, if you search 100 times a day, all the 100 times are valid (provided that no one is searching ). As shown in the following figure:

Without accurate statistics, we may not discuss whether it is good or bad. But from the perspective of users, I like Google's advertising model, because we often face the issue that we cannot find a piece of information when we need it. If we don't need it, it will harass us.
In the wave of Gmail, we also found Google's content-related ads. When you read English letters (which may be due to both technical and market considerations, there is no advertisement for Chinese letters currently), you will find that there are advertisements related to your letter content on the right side of your mailbox.
Google AdWords and Google AdSense
Google calls the services provided to advertisers Google AdWords and the services provided to ad publishers Google AdSense. Google is actually an advertising agency. What Google does is, when appropriate, on the pages of the appropriate ad publishers (we can think that Google's search engine page is also an advertisement publisher, display the appropriate advertisement of the advertising customer.
First, let's take a look at how I got Google's services as an online store selling "digital cameras. First, I shouldGoogle AdWordsLog on to the website, and enter the text of the advertisement I want to display, such as "monopoly on the Internet of digital cameras", and keywords that I want to trigger my advertisement, such as "digital cameras, DC ". Then, I need to confirm the charge (minimum 5 cents, maximum 100 USD) I pay for one click and the maximum charge I plan to pay every day (minimum 5 cents, maximum limit ). Then, how to present the advertisement and how to present it is a problem for Google.