1. 恐吓软件：
恐吓软件是一种恶意软件，它伪装成合法的计算机安全软件，并声称可以检测受影响计算机上实际上并不存在的各种威胁。然后，用户会被告知他们必须购买恐吓软件才能修复他们的计算机，并且会收到咄咄逼人的弹出通知，直到他们提供信用卡号并为毫无价值的恐吓软件产品支付所需的金额。
2. 广告软件：
广告软件并不完全是恶意的，但它们确实出于恶意目的侵犯了用户的隐私。它们在计算机桌面或单个程序内显示广告(出现一个弹出窗口)。它们主要附带免费使用的软件，因此是此类开发人员的主要收入来源。他们基本上会监控您的兴趣并显示相关广告。攻击者可能会在软件中嵌入恶意代码，广告软件可以监控您的系统活动，甚至可以危害您的机器。
恐吓软件和广告软件的区别：
| S.No. | Scareware | Adware |
|---|---|---|
| 1. | Scareware is a tool to help fix your system but when the software is executed it will infect your system or completely destroy it. | Adware is similar to a spyware and it can be both intrusive and difficult to eradicate. |
| 2. | It is more harmful as compared. | Adware is less harmful. |
| 3. | Scareware can be detected in browser by pop up notification and removed by the Antivirus and firewall. | Adware can be detected and removed by the antivirus program. |
| 4. | It give unauthorized access and control of the system to the hackers. | It provides profit to the developer by generating online advertisement. |
| 5. | Scareware is one of the type of malware. | Adware is one of the type of malware. |
| 6. | It displays windows- style popups. | It displays a software. |
| 7. | In this, user should immediately close the browser. | In this, user should restore the PC to gain access. |
| 8. | DriveCleaner, WinAntivirus, ErrorSafe, WinFixer and XP Antivirus are some of the examples of scareware. | Fireball, Appearch, Gator and dollarrevenue are some of the examples of adware. |