4. SEO
• the process of improving the ranking of a website on web
search engines
SMM
• Gaining website traffic or attention through social media
sites
SEM
• promoting websites by increasing their visibility in search
engine results
5. Google
Yahoo!
Bing
Ask.com
Soso.com - China
Baidu - China
Seznam.cz - Czech Republic
Yandex - Russia
Rambler - Russia
Timway - Hong Kong
Onkosh - Arabic search - Middle East
Aýna - Arabic search - Middle East and North Africa
Leit.is - Iceland
justdial.com - India
6. CPA - Cost per acquisition / action
CPC - Cost per click
CPM - Cost per thousand (impressions)
CTR - Click-through rate
PPC - Pay per click
PR - PageRank
ROI - Return on investment