To be honest, I never really understood what cookies were until I took an Internet Marketing class. I had always heard of them, usually grouped in with cache and history, but I was not sure exactly what they did. Upon hearing that they could be used to track activity, I was a little scared. Privacy seems to be a big issue in today’s technology-driven world, but I wanted to find out for myself whether cookies should be feared or accepted.
After researching, I have found that cookies bring a lot of convenience into my internet use. One benefit I experience is that cookies store usernames and passwords. This prevents Facebook from requiring me to login every time I click on a link, and Google Chrome remembering my login information so I do not have to type it. 
Most cookies do not identify you personally, just data that would be useful for marketing analysis, like browsing activity. The cookie would then be used to bring you more targeted ads based on what you searched the day before.
In my experience, cookies used for advertising can be bothersome. There have been a few times where I was on a website, and an array of shoes popped up that were similar to some I was looking at the day before. At first I found it off-putting and felt my privacy had been invaded, but in reality, it is just companies trying to make more sales. One annoying thing I am dealing with right now are targeted ads popping up on YouTube. For a project in my Internet Marketing class, I researched a web hosting company and frequently visited their site throughout a few days in order to get information. Almost two months later, an ad for their website pops up on almost every YouTube video I watch. And I did not and do not want to use their product, I was just researching!
Although cookies can be obnoxious and violate a small portion of privacy, they can ultimately make the Internet easier to use.