1. 病毒：
病毒是附加到另一个可执行文件的恶意可执行代码，它可以是无害的，也可以修改或删除数据。当计算机程序运行时带有病毒，它会执行一些操作，例如从计算机系统中删除文件。远程控制不了病毒。
2. 间谍软件：
间谍软件是一种恶意软件，可以执行某些工作，包括监视和跟踪用户操作以及收集个人数据。间谍软件程序通常将自己安装在系统上，并在未经系统用户同意的情况下通过收集系统用户的数据向第三方提供利润。恶意间谍软件还试图通过在系统后台运行来捕获用户的密码和个人信息。
病毒和间谍软件的区别：
| S.No. | VIRUS | SPYWARE |
|---|---|---|
| 1. | A Virus is a malicious executable code attached to another executable file which can be harmless or can modify or delete data. | Spyware is a form of malware designed to collect your personal information. |
| 2. | The main objective of virus is to modify the information. | The main objective of the spyware is to monitor the activity of the system. |
| 3. | Antivirus software are used for protection against viruses. | Spyware can be detected and removed by the anti-spyware program. |
| 4. | It can control data and resources, cause error, destroy system and slow down the performance. | It provides profit to the third party by collecting data of user without his awareness. |
| 5. | It is more harmful. | It is less harmful as compared. |
| 6. | Virus replicates itself. | Spyware does not replicate itself. |
| 7. | Resident and Non-resident viruses are two types of Virus. | Bonzibuddy, Cydore and Downloadware are some examples of spyware. |