Paid search advertising has not been without controversy and the issue of how search engines present advertising on their search result pages has been the target of a series of studies and reports[24][25][26] by Consumer Reports WebWatch. The Federal Trade Commission (FTC) also issued a letter[27] in 2002 about the importance of disclosure of paid advertising on search engines, in response to a complaint from Commercial Alert, a consumer advocacy group with ties to Ralph Nader.
Yes, Google still does use the meta description quite frequently. I know it seems like sometimes they don't. But, in fact, there's a high percent of the time when the actual meta description from the page is used. There's an even higher percentage where the title is used. The URL, while Google sometimes truncates those, also used in the snippet as well as other elements. We'll talk about schema and other kinds of markup later on. But the snippet is something that is crucial to your SEO efforts, because that determines how it displays in the search result. How Google displays your result determines whether people want to click on your listing or someone else's. The snippet is your opportunity to say, "Come click me instead of those other guys." If you can optimize this, both from a keyword perspective using the words and phrases that people want, as well as from a relevancy and a pure drawing the click perspective, you can really win.
PPC gives you the ability to fix your daily budget depending on how much you’re willing to spend. And since you can start off with a small amount, you don’t have to put a heavy investment at stake before testing the waters. Once you know a certain campaign is giving you a good return on investment, you can ramp up your budget and increase your ad spendings without worrying about incurring losses.
All too often, people dramatically overthink the most basic keyword research concepts; keyword generation should start simply with answering the question of "What products or services do you sell?" If you sell dog food online,  the root words dog and food alone would be very poor keywords because on their own, neither dog nor food do a remotely good job at describing what you sell. Though this example makes it obvious, many times we have to fight through our urge to include those bigger, broader root keywords.

Repeat this exercise for as many topic buckets as you have. And remember, if you're having trouble coming up with relevant search terms, you can always head on over to your customer-facing colleagues -- those who are in Sales or Service -- and ask them what types of terms their prospects and customers use, or common questions they have. Those are often great starting points for keyword research.
Starting in 2014 and kicking things up a notch two years later, Google’s Keyword Planner tool began grouping volumes for similar terms. Instead of showing keyword A gets searched 100 times per month and keyword A1 gets searched 50 times per month, both would show 150. Google said the reason for this to make sure “you don’t miss out on potential customers” and to “maximize the potential for your ads to show on relevant searches.”
Website:  Websites are a great way to establish your brand identity. They can use text, images, audio, and video elements to convey the company's message, as well as inform existing and potential customers of the features and benefits of the company's products or services. The website may or may not include the ability to capture leads from potential customers or directly sell a product or service online. 
Thanks for the helpful information discussing the differences and similarities between SEO and SEM. The information was enlightening because a search engine optimization company like the one that I own is relatively new at starting. We believe everyone should always check out their sources because every different perspective is very different so all approaches can be understood differently.