Personalization broadly known as customization

Promotional merchandise
Promotional items (
mugs
, 
T-shirts
, 
keychains
, 
balls
etc.) are regularly personalized.
Personalized children's storybooks—wherein the child becomes the 
protagonist
, with the
name and image of the child personalized—are also popular. Personalized CDs for children
also exist. With the advent of 
digital printing
, personalized calendars that start in any month,
birthday cards, cards, e-cards, posters and photo books can also be obtained.
3D printing
3D printing
 is a production method that allows to create unique and personalized items on a
global scale. Personalized apparel and accessories, such as jewellery, are increasing in
popularity.
[11]
 This kind of customization is also relevant in other areas like 
consumer

---

electronics
[12]
 and 
retail
.
[13]
 By combining 3D printing with complex software a product can
easily be customized by an end-user.
Mass personalization
Mass personalization is defined as custom tailoring by a company in accordance with its end
users' tastes and preferences.
[14]
 From a collaborative engineering perspective, mass
customization can be viewed as collaborative efforts between customers and manufacturers,
who have different sets of priorities and need to jointly search for solutions that best match
customers' individual specific needs with manufacturers' customization capabilities.
[15][16]
The main difference between mass customization and mass personalization is that
customization is the ability of a company to allow its customers to create and choose a
product to certain specifications, but does have limits.
[17]
One example of mass personalization: A website knowing a user's location and buying habits
will offer suggestions tailored to that user's demographics. Each user is classified by some
relevant trait (location, age, and so forth) and then given personalization aimed at that group.
This means that the personalization is not individual to that singular user, it only pinpoints a
specific trait that matches them up with a larger group of people. 
[18]
Behavioral targeting
represents a concept that is similar to mass personalization.