Cache refers the storage that gathers temporary data. Cache can be used to speed up the loading of webpages, browsers, and applications, to improve onboarding, and to remember your shopping cart contents. A cache could be found on any computer, laptop, or phone, in any online browser or app.

A case study is a method of organizing knowledge regarding a specific subject. It is a study about a case that aims to explain know-how. The phrase "case study" is used in a variety of contexts depending on the field. Case studies in medical, for example, may focus on a specific patient or condition, whereas case studies in business may cover a specific business' strategy or a spesific market.

Churn rate indicates how many of your customers stop paying you and no longer do business with you over a certain period of time. It's calculated by dividing the number of customers who stopped doing business with your company during a certain time period by the total number of customers in the same period. At first glance, “churn rate” sounds straightforward enough. But the reasons behind its increase are not as simple when dissected and analyzed. Understanding why customers are leaving can help you determine how to stop this from happening altogether.

Clean code is a term that gets thrown around a lot in the software development community. The most common definition of clean code is code that is simple to read and change. The goal of Clean Code is to make the act of maintenance transparent, so that programmers can focus on building new features rather than spending time debugging old ones.

Conversion is a digital product term that refers to desired actions users took. Conversion rate, on the other hand, is a metric to measure conversions. It is calculated by simply splitting the number of all traffic into a number of the desired action.

A cookie is a unique value stored on your browser assigned by websites you visit. Cookies can track your visits and collect data from your browser. There are different types of cookies as session, authentication, tracking, etc.

Cookie policy is the text that websites inform users about the existence, purpose and usage of cookies. Cookie policies shown in some cases due to legal obligations and in some cases ethical concerns after increasing security discussion.

CRO stands for conversion rate optimization. It includes all efforts aimed to increase the conversion rate of a product, ad, creative, website, online shop, mobile app, etc.

CAC is short for customer acquisition cost. It's a metric to measure the average marketing cost of acquiring a customer. To calculate CAC the total amount marketing spendings (direct and indirect) are devided by acquired customers in a certain amount of time. CAC = Marketing Costs / Acquired Customers

Cusromer effort score (CES) is a single number that summarizes the quality of customer experience of an ogranization. CES measures the effort required for a customer to make an interaction that leads a conversion (purchase,subscription etc.) or gets a request fulfilled. Users are asked to grade their experience over a likert scale -or a similar system- right after their interaction. Total score devided by total number of surveys makes the CES. It provides a holistic benchmark for measuring effectiveness of your product.

Customer lifetime value (CLV) is the total income a business can expect from an average customer for as long as that person or account remains as a customer. It is important to track CLV because it impacts your revenue thus your marketing and product strategy. To calculate customer lifetime value, multiply a customers value (average purchase * no. of purchases) with customer lifetime. CLV = Customer Value * Customer Life Time

CX stands for customer experience. Customer experience is about everything the customer interacts with products, services or the brand, not just the digital interactions in UX.