Purpose of "class" keyword

Java is an Object Oriented Programming System, every Object is to represent a
Real-world Entity i.e (Book, Fan, Person, Product ), Real World Entities having properties for
example "Book" is a Real World Entity can contain properties like "Book Title","Author Name",  "Publisher Name","price" e.t.c, if we want to represent this Real World Entity in java we use a special "keyword" called "class"  every property  represents a type like (integer, String , character, float or it can be any reference types )
BookTitle,, AuthorName, PublisherName    is simple String
and the price is of float
which accepts decimal values.

ex :
class Book{
String bookTitle;
String authorName;
String publisherName,
float price;
}

above example represents a real world entity Book  and having its properties

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