PPC is a paid side of advertisement that a advertiser has to pay some amount for every click on their ads. While search engine optimization is a process in which you rank your website in the organic results of search engines.
PPC means pay per click, which is a concept on internet marketing that you need to pay some amount on every clicks. While CPC is cost per click, which is term under PPC pointing the actual cost that advertiser has to pay for every click.
CPA means cost per acquisition, it is a kind of bid strategy in which chance of coversion get increases when your ad gets clicked. In this strategy after getting your conversion history, Google will control your ads impression to the user who are more liable to conversion.
CPM means cost per thousand impression, it is a kind of bid starategy for display ads. In CPM based ads you will have to pay for every 1000 impressions of your ad on sites. This startegy is basically being used to increase brand awareness.
CTR basically depends on clicks that you are getting for total number of ads impression.
Improving CTR means improving your click rate, which you can achieve by-
Showing your ads on top of the page.
Keyword Relevancy of your ads.
Ads relevancy with regard to your landing page.
CPC is cost per click and CTR is click through rate, they both can not be compared to each other when it comes to lead generation. Actually CPC is nothing, but its avg. CPC which means the actual click cost and that can be decided by one of the factor that is CTR (rate at which ad gets clicked...
ECPC is Enhanced cost per click, this is a kind of automated bid strategy which is also available in manual cpc bidding. This bid strategy provides the facility of automatically increase the current cpc value to 30% more, when it seems that the current scenerio is more liable for conversion.
Link baiting is a piece of content that is specially curated in such a manner that it could enthrall user to link to that content, it can be text content, video, graphical information. It is done to create more and more backlinks and increase rank over search engines.