Adware (advertising-supported software) is a common type of software that automatically displays or downloads advertising material such as banners or pop-ups when a user is online.

This is a common type of software, mainly used by advertisers. When you go online, it records your web surfing habits to gather information on the type of sites you search for. This information is used to direct marketing pop-ups and spam email. When advertisements keep popping up on your computer, you have downloaded some type of adware.

When adware logs the keys you type and possibly record other activities you perform on your computer whether you are online or offline, then it is spyware.

So adware which collects information other than your internet-browsing habits, it is called spyware. Spyware is capable of tracking user activity and stealing personal information. Adware comes under the umbrella definition of malware 

Spyware is unwanted software that infiltrates your computing device, stealing your internet usage data and sensitive information. Spyware is classified as a type of malware

As its name suggests, is designed to spy on what a user is doing. Hiding in the background on a computer, this type of malware will collect information without the user knowledge. 

Spyware is used for many purposes. Usually it aims to track and sell your internet usage data, capture your credit card or bank account information, or steal your personal identity. Spyware monitors your internet activity, tracking your login and password information, and spying on your sensitive information.

Some types of spyware can install additional software and change the settings on the device. It is always important to use secure passwords and keep devices updated.

Spyware is one of the most common threats on the internet. It can easily infect your device and it can be hard to identify. Spyware is a threat to businesses and individual users, since it can steal sensitive information and harm your network.

Basically there are four main types of spyware. Each uses unique tactics to track you.They are  Adware, Trojan, Tracking cookies and system Monitors.

What is Trojan ?

This kind of malicious software disguises itself as legitimate software. For example, Trojans may appear to be a Java or Flash Player update upon download. Trojan malware is controlled by third parties. It can be used to access sensitive information such as Social Security numbers and credit card information.

What is Tracking cookies ?

These track the user’s web activities, such as searches, history, and downloads, for marketing purposes.A cookie is a small text file that is used to save user-specific data. 

What is System monitors ?

This type of spyware can capture just about everything you do on your computer. System monitors can record all keystrokes, emails, chat-room dialogs, websites visited, and programs run. System monitors are often disguised as freeware.

History of Adware

Adware use began roughly in 1995, some industry experts considered all adware to be spyware. Later, as the legitimacy of adware grew, it was thought of as merely a “potentially unwanted program.” As such, its use proliferated and not too much was done to monitor its legitimacy. It wasn’t until the peak adware years of 2005–2008 when adware vendors started to monitor and shut down questionable activities.

Freeware Shareware

The adware gets installed with free software application also known as freeware or shareware. Once the new software is downloaded and installed, so is a program (adware) that will track the websites you visit. Adware can find its way onto computers via infected websites through an unauthorized installation.

Adware is mostly used legitimately though can be malicious in nature. Adware can also spread through email attachments and shared files. Adware programs run in the background when you are online, and they can slow down your computer and affect its performance.
Mobile adware-

1. Infection by browser refers to a known exploit, caused by the way most browsers handle redirections executed by JavaScript code. …
2. Infection by downloaded applications refers to getting infected with persistent ads through adware apps installed on a phone.

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