Adware can be identified as any type of software application where advertising pop ups are displayed while another programme is running. The biggest issue with Adware, aside from the annoyance, is that it normally contains extra code. This code tracks the user’s personal information for the purpose of passing it on to other parties without Your Approval.
Spyware is software which is developed to use your Internet connection through a “back door” without your knowledge or permission. In this way the owners of the spyware are able to access your information, again without Your Approval.
Malware is software that enters your machine like the 2 above but has the ability to send you data across your internet connection. The software will load with or without your approval as the accept and decline buttons can be ambiguous. Alternatively it will be included with software that you want, therefore it is a valued add on, frequently without you realising it is there.