Malware, or malicious software, is any program or file that is intentionally harmful to a computer or a device such as a mobile phone. Types of malware can include computer viruses, worms, Trojans, ransomware and spyware. These malicious programs steal, encrypt and delete sensitive data and can disrupt or hijack central computer functions, as well as monitor the activity of those using such devices. All types of malware are designed to exploit devices at the expense of the user and for the benefit of the person who is carrying out the attack or who has designed and/or implemented the malware.

You can detect the presence of malware on your devices by looking for signs of unusual activity, such as a sudden loss of disk space, unusually slow speeds, crashes (or repeated crashes) or an increase in unwanted Internet activity, as well as an increased number of pop-up ads. 

The recommendation is to install antivirus and antimalware software on your device, which should be kept active and up to date to detect and eliminate malware. It is also important not to install suspicious updates and programs that could be downloaded from untrustworthy sites or sources, and to avoid opening and running unsolicited attachments.