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Call to Action

A Call-to-Action is a marketing message that encourages users to take action and engage in the sales activity such as buying a product or service, signing-up for a newsletter, enrolling on a websites, downloading an ebook or website brochure etc.

Canonical URL

When multiple versions of a URL exist and they hold same or slightly different content, webmasters may want to define the most authoritative version as the canonical version so that search engines know which version of that page to index.


Chatbots are computer programs often ly integrated into the dialog systems for virtual assistance in auditory or textual methods. There are two different types of chatbots: one which functions based on rules and other one functions using machine learning.

Click Through Conversion(CTC)

A Click-through-conversion is when someone clicks through your ad to your landing pages and completes the desired conversion action such as buying a product, downloading an ebook, or filling a lead form. Basically when an ad click is immediately followed by the conversion action, a click-through-conversion takes place.

Click Through Rate(CTR)

Click through rate represents the percentage of users who click on an ad and reach a website.


Clocking is a black hat SEO technique that presents different content or URLs to human users and search engines. Its considered a violation of Google’s Webmaster Guidelines

Contact Form

A contact form, as the name suggests is a web form that is used to allow website visitors to send a message to the webmaster or website owner.

Content Amplification

Content amplification refers to expanding the reach of your content. This is done by marketing your marketing content. Currently its most popular for PR marketing.

Content Pillar

Officially: "A content pillar is a large piece of content that can be broken down into smaller pieces of content and utilized in different types of marketing activities."

Contextual Advertising

Contextual advertising is a form of highly targeted advertising where ads are shown on pages having relevant or similar sort of content. This is done by first scanning the publisher websites for a given set of keywords and creating a list of sites where ads are allowed to run.

Conversion Rate

Conversion rate is defined as the percentage of the website visitors which finally undergo the conversion, which in turn can be defined as the completion of website's intended behavior by visitors.


A web Cookie is a small data packet stored in the web Browser program of a user who is browsing online. Cookies are used to track user activity and store information about user's online behavior on the website which created the Cookie.

Cost per Acquisition (CPA)

Cost per Acquisition (CPA) refers to cost of a conversion in online advertising. In online CPC advertising it is calculated by dividing the total advertising cost by the todal number of conversion in a given period of time.

Cost per Click (CPC)

Cost per acquisition is the average cost of acquiring a customer or completing a sale.

Cost per Impression (CPM)

Cost per acquisition or CPM is one of the bidding model in online advertising. It is the cost for 1000 impressions of an ad.

Cost per Lead

Cost per lead is a payment method where the advertiser pays to a publisher/marketer/affiliate based on the number of leads generated. This is generally used in affiliate marketing model.


A Crawler is a software that automates the process of web indexing.

Custom Error Page

It's a web hosting feature provided by most web servers. It allows webmasters to specify a default page that can be displayed when an error is encountered.