Explanation:

In the relation model, the basic building block is the relation. A relation is also known as a table in a relational database. It consists of rows and columns, where each row represents a record or a tuple, and each column represents an attribute or a field.

Tables:
Tables are the main structures in the relational model. They are used to organize and store data in a structured manner. In a table, data is arranged in rows and columns. Each table has a unique name and consists of a set of attributes or fields.

Attributes:
Attributes are the characteristics or properties of a table. They define the type of data that can be stored in a column. Each attribute has a name and a domain. The domain specifies the range of values that an attribute can take. For example, in a table of employees, the attributes can be employee_id, name, age, and salary.

Tuples:
A tuple, also known as a record, is a row in a table. It represents a single instance or occurrence of data. Each tuple consists of a set of values, one for each attribute of the table. For example, in a table of employees, a tuple may represent a single employee with values for attributes like employee_id, name, age, and salary.

Relation:
A relation is a set of tuples that have the same attributes. It represents a logical connection or association between the tuples. In other words, a relation is a collection of related data stored in a table. Each tuple in a relation is unique, and the order of the tuples does not matter.

Conclusion:
In the relation model, the relations are generally termed as tables. Tables consist of rows, which are also called tuples, and columns, which are also called attributes. The relations represent the logical connection or association between the tuples, and they form the basis of the relational database model.