Now you know how to create vectors. Assume that the vector represents valuable information, for example, grades (on a scale from 1 to 100). But grades themselves most likely will not be understood by another person.

Assume that the grades are the next:

|Subject|Grade|
|---|---|
|Math|80|
|Physics|75|
|English|95|
|Literature|100|

You know how to create a vector with grades. But how do you assign specific names to values? You can do it by assigning to `names(vector)` the vector of names. The `vector` in parenthesis is the vector of which elements you want to name.
Let's look at the example.

grades <- c(80, 75, 95, 100) # Vector of grades
# Assign names to values of grades
names(grades) <- c('Math', 'Physics', 'English', 'Literature')
grades # Output the vector of grades

The code above will output the following text:
```
      Math    Physics    English Literature
      80         75         95        100
```
That looks much better.

In the first section, you will consider the very basics of R - outputting and performing basic operations. You will finish the section with the variables theory.

In the second section, you will learn the vector class in R, which represents single values too. You will consider the main data types for single values and how to work with multiple values of a kind at once.

Factors (or categorical variables) are widely used in real life. These are blood types, currencies, nationalities, brands, etc. Unlike numerical variables, factors are limited to a finite number of values.