Transacted: A sale has transpired when a contract is signed by both parties. From a salesperson’s perspective, the fulfillment of the contract is the responsibility of other parts of the organization, and the salesperson can now focus on the next opportunity. In the case of early-stage start-ups, however, frequently the person that sells is also involved in fulfilling the contract. A signed contract can be booked as revenue from an accounting perspective.
It's no surprise Unbounce is near the top of this list -- they've actually written the book on creating high-converting landing pages. Although there are lots of amazing things about this landing page, the two that I absolutely love are: 1) The use of a chat window instead of a classic form, and 2) the detailed -- but well packaged -- information below the form.

A/B testing, or A/B split testing, is a method for testing two versions of a webpage: version "A" and version "B". The goal is to test multiple versions of webpages (e.g., home page vs. product page) or one specific element that changes between variation A and variation B (such as having a lead form on the left hand side or having it placed on the right hand side), FAQ to determine which version is most appealing/effective. This testing method may also be known as A/B/n split testing; the n denoting more than 2 tests being measured and compared. The data for A/B testing is usually measured via click-through rate or an alternative conversion tracking method.[11]

Of course, the address itself won't be enough to estimate the value of a home. It just denotes the home's neighborhood. That's why the next page follows with more questions about the property itself, like number of beds and baths. Below, you see the copy "Tell us where to send the report" -- with a disclaimer that, by entering this information, you're agreeing to connect with a real estate agent. This is a great example of a company giving value to their visitors from the get-go, while setting visitors' expectations about what will happen as a result.
Trulia did something very similar to with their landing page. It starts with a simple form asking for "an address" (which sounds less creepy than "your address," although that's what they mean). Below this simple form field is a bright orange button that contrasts well with the hero image behind the form, and emphasizes that the estimate will be personalized to your home.

Landing pages are often linked to social media, e-mail campaigns or search engine marketing campaigns in order to enhance the effectiveness of the advertisements. The general goal of a landing page is to convert site visitors into sales or leads. If the goal is to obtain a lead, the landing page will include some method for the visitor to get into contact with the company, usually a phone number, or an inquiry form. If a sale is required, the landing page will usually have a link for the visitor to click, which will then send them to a shopping cart or a checkout area. By analyzing activity generated by the linked URL, marketers can use click-through rates and conversion rate to determine the success of an advertisement.[3]
Landing pages originated with the IT departments of Microsoft in late 2003 in response to poor online sales of Office.[5] The process was tedious and time-consuming. As a result, in 2009, several startups, including Unbounce, were formed to simplify and streamline the process. The rise of cloud computing and e-commerce around 2009 provided ideal conditions for these startups to flourish.[5] Since then the customer requirements changed, requesting integrations with other solutions such as email marketing, lead nurturing and customer relationship management systems.
The messaging on the page reinforces the reason for their click, reducing or removing confusion and therefore increasing conversion rates. This improves overall user experience and reduces the bounce rate (individuals leaving the site without converting or navigating to another portion of the site) for the page. Good message matching can increase conversion by up to 50% in many cases.[13]