The BETWEEN operator is a commonly used operator in SQL (Structured Query Language) that allows you to filter query results based on a specified range of values. It is used in the WHERE clause of a SQL query to retrieve records that fall within a given range.

The syntax for using the BETWEEN operator is as follows:

SELECT column_name(s)
FROM table_name
WHERE column_name BETWEEN value1 AND value2;

In this syntax, `column_name` is the name of the column you want to filter, `table_name` is the name of the table containing the data, and `value1` and `value2` represent the range of values you want to use for filtering. The BETWEEN operator includes both `value1` and `value2` in the result set, which means it retrieves records where the column value is greater than or equal to `value1` and less than or equal to `value2`.

For example, suppose you have a table named "employees" with a column "salary." If you want to retrieve all employees whose salaries fall within a range of $40,000 to $60,000, you can use the BETWEEN operator like this:

SELECT *
FROM employees
WHERE salary BETWEEN 40000 AND 60000;

The query will return all records from the "employees" table where the "salary" column value is between $40,000 and $60,000, inclusive.

It's important to note that the BETWEEN operator is inclusive, meaning it includes the values of `value1` and `value2`. If you want to exclude either end of the range, you can use the greater than (>) or less than (<) operators instead.

In summary, the BETWEEN operator in SQL is a useful tool for filtering data within a specific range, making it easier to retrieve the desired information from a database. By using the BETWEEN operator, you can create more precise and efficient queries to meet your data retrieval needs.  Apart from it by obtaining SQL Certification, you can advance your career in the field of SQL Servers. With this Certification, you can demonstrate your expertise in working with SQL concepts, including querying data, security, and administrative privileges, among others. This can open up new job opportunities and enable you to take on leadership roles in your organization.