Paid search marketing (PPC)
Paid search marketing means you advertise within the sponsored listings of a search engine or a partner site by paying either each time your ad is clicked (pay-per-click - PPC) or less commonly, when your ad is displayed (cost-per-impression - CPM).
Display advertising
With display advertising you can:
Create all types of ads - text, image, interactive and video ads.
Place those ads on websites that are relevant to what you're selling.
Show those ads to the people who are likely to be most interested.
Manage and track your budget, campaigns and results as you go.
Content marketing
Content marketing's purpose is to attract and retain customers by consistently creating and organizing content that is relevant and of value to your customers both existing and potential.
Google Adwords
Google Adwords is the system Google has developed to assist you in marketing your products or services in the Google Search Engine, and its affiliate sites, via the use of a placed text ad that appears when people search for phrases related to your offering, this appears as a "sponsored link".
Social Media Marketing
Social media marketing is the process of gaining website traffic or attention through social media sites. Social media marketing programs usually center on efforts to create content that attracts attention and encourages readers to share it across their social networks.
Google Display Network
The Display Network is a collection of websites - including specific Google websites such as Google Finance, Gmail, Blogger and YouTube - that show AdWords ads. This network also includes mobile websites and apps. If you've ever seen an AdWords ad on your favourite news website or in your Gmail account, and wondered how it got there, now you know: websites like these are part of the Google Display Network.
Source:Google