Question

Please help me to answer these ticked questions.....
Only questions marked with blue pen should solved...
Please it's very urgent.. Help me...

Answer 1

In a computer the visible things are hardware like motherboard moniter
Invisible things are software like programs

Answer 2

[1]Computer hardware is any physical device used in or with your machine, whereas software is a collection of code installed onto your computer's hard drive.
[4]The operating system (OS) is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs and applications. 
[7]System software is a type of computer program that is designed to run a computer's hardware and application programs. 
System software is software on a computer that is designed to control and work with computer hardware. 
[8] 1- A word processor is a computer program that provides special capabilities beyond that of a text editor such as the WordPad program that comes as part of Microsoft's Windows operating systems. 
2-An spreadsheet is a computer application that displays and organizes data. Each data is stored in a cell of a worksheet and can be manipulated using formulas to calculate or change the data in other cells. The spreadsheet originated as an electronic equivalent of a paper accounting worksheet.
3 - A database management system (DBMS) is system software for creating and managing databases. The DBMS provides users and programmers with a systematic way to create, retrieve, update and manage data.
4- A presentation software is a computer software package used to show information, normally in the form of a slide show. 
[9]A program that performs a very specific task, usually related to managing system resources. Operating systems contain a number of utilities for managing disk drives, printers, and other devices. Utilities differ from applications mostly in terms of size, complexity and function.
[10]A computer virus is a type of malicious software program (malware) that, when executed, replicates itself by modifying other computer programs and inserting its own code. Infected computer programs can include, as well, data files, or the "boot" sector of the hard drive.
[11] Antivirus is a program which makes your system clean and secure from harmful virus, worms and attacks through scanning process. It detects suspicious websites and files that contain malicious programs before they enter the computer and block malicious tracking software from being downloaded to your system.
[13]Utility software is system software designed to help analyze, configure, optimize or maintain a computer.
[14]Data Encryption and Decryption. Encryption is the process of translating plain text data (plaintext) into something that appears to be random and meaningless (ciphertext). Decryption is the process of converting ciphertext back to plaintext. To encrypt more than a small amount of data, symmetric encryption is used.
[15]Ciphertext is encrypted text. Plaintext is what you have before encryption, and ciphertext is the encrypted result. 
[18] bespoke software or tailor-made software) is software that is specially developed for some specific organization or other user. 
Disadvantages -
1. Inability find all expertise in-house.
2. Development will take longer than purchasing ready-made software.
3. As the software is being developed from scratch, there is a risk that the package may not perform as intended.
4. There is a greater chance of ‘bugs’. Widely used off-the-shelf software is more likely to have had buds identified and removed.
Advantages-
1.bespoke software is easy to use because it works the way you work.
2. You are in control - changes can be implemented quickly, as your business grows, or to meet new legislation or client requirements.
3.Bespoke applications increase productivity, and reduce costs by automating repetitive tasks.