Question

write important topic of type of software

Answer 1

system software:: those manages hardware of computer like device drivers
application software:: those help in office work like ms word
utility software:: those which in computer clean like ccleaner, antivirus

Answer 2

SOFTWARE
The term 'software' refers to the set of electronic program instructions or data a computer processor reads in order to perform a task or operation. 

SYSTEM SOFTWARE
Systems software includes the programs that are dedicated to managing the computer itself, such as the operating system, file management utilities, and disk operating system (or DOS). The operating system manages the computer hardware resources in addition to applications and data. 

APPLICATION SOFTWARE
Application software, or simply applications, are often called productivity programs or end-user programs because they enable the user to complete tasks, such as creating documents, spreadsheets, databases and publications, doing online research, sending email, designing graphics, running businesses, and even playing games! Application software is specific to the task it is designed for and can be as simple as a calculator application or as complex as a word processing application. When you begin creating a document, the word processing software has already set the margins, font style and size, and the line spacing for you.