PL/SQL stands for procedural language; structured query language is known to be a block structured language. This was developed by Oracle corporation in the year 1980s. It is the Oracle corporation’s extension for SQL and also the relational database. This is also available in Oracle Database since version 7 which stores procedures, functions, packages, triggers. Times Ten in-memory database since the version 11.2.1 and also IBM DB 2 since the version 9.7. it is said that the Oracle corporation usually uses PL/SQL functionality with the different successive releases of each oracle database.  

And then the PL/SQL language also includes procedural language elements like conditions and loops. PL/SQL allows declarations of constants and also variables of those types and also triggers. It can handle exceptions that are run time errors. Arrays are also supported by involving the collections in PL/SQL. And from version 8 they have also included features that are associated with object orientation. Any programmer or the user can create all this PL/SQL units like functions, packages, procedures, types, and also triggers that are stored in the Database for reusing by all the applications that will be using any of the Oracle Database programmatic interfaces. 

PL/SQL overcomes all the drawbacks of SQL, this is known to be a procedural language that provides the functionality of decision making, iteration and also many features like other procedural programming languages. PL/SQL program unit can be any one of the units following like PL/SQL anonymous block, the procedure, the function, package specification, package body, trigger, type specification, and also type body library. These program units are said to be the source codes that are said to be compiled, also developed and then ultimately execute on the database. Some of the notable facts about PL/SQL:

1. It is said to be completely portable, and also high-performance transaction processing language.
2. It provides a built-in interpreted and OS independent programming environment. 
3. It can directly be called from the command line SQL *Plus Interface.
4. Direct calls can be made from external programming language calls to the database. 
5. Its general syntax is based on ADA and pascal programming language. 
6. Apart from Oracle, we can say that PL/SQL is also available in the TimesTen in-memory database and IBM DB2. 

Some of the features of PL/SQL has the following features:

1. It is tightly integrated with the SQL.
2. It can offer extensive error checking.
3. It also offers different variety of programming structures. 
4. It supports structured programming through functions and also the procedures. 
5. It also supports object-oriented programming.
6. It can support the development of web applications and also the server pages.