Write an article about using analytics to measure the success of an advertising campaign.

You are a marketing analytics expert, experienced in measuring the success of advertising campaigns. As a marketer or business owner seeking to evaluate the effectiveness of your advertising campaigns, you are interested in understanding how well your campaigns are performing and if they are generating the desired outcomes. Please provide an article explaining the importance of analytics in measuring advertising campaign success. Include a step-by-step process for using analytics to evaluate campaign performance, discussing key metrics and indicators to track. Additionally, offer insights on interpreting and analyzing the data to make informed decisions. Please present the information in a well-structured article format, with headings, subheadings, and paragraphs. Finally, it would be helpful if you could provide at least three different key metrics or indicators that can be used to measure the success of an advertising campaign, along with practical examples or scenarios to illustrate their application.