Up until recently, you could only get an adware remover as part of an anti-spyware program, but recently programs have come out that are advertised as dealing primarily with adware. Some of these programs also detect and delete spyware. Here's what being said about them:

Dec 07, 2019 Adware. - Malwarebytes Labs | Malwarebytes Labs | Detections Adware is typically a standalone program which displays adverts to the end-user in a variety of forms, including: inside the program itself via pop-ups and pop-unders, in or outside the browser How to remove PromoteMethod adware (Virus removal guide) Jul 13, 2020 Malware - CNET

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Malware (a portmanteau for malicious software) is any software intentionally designed to cause damage to a computer, server, client, or computer network (by contrast, software that causes unintentional harm due to some deficiency is typically described as a software bug). A wide variety of types of malware exist, including computer viruses, worms, Trojan horses, ransomware, spyware, adware