How can smart gadgets be protected from viruses?

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Install anti-virus software and keep it up to date: it usually prevents the device from known viruses. The anti-virus software on a device must be kept up-to-date so that it can deal with new threats.

Never open email attachments that contain executable files - files with extensions such as .exe, .com and .vbs. They are capable of doing whatever wrong they have been programmed to do if opened.

Never open email links that you don’t trust. Treat it as a source that you are not expecting, similar to executable files.

Never run macros in a document unless you are certain of its purpose. A macro is a way of automating repetitive tasks and are more commonly used in Windows applications like Microsoft Word, Excel, PowerPoint and others. It is now uncommon to have any reason to use a macro.

Be careful when opening graphics or media files. Although graphics and media files themselves are not viruses, it is possible for a virus to be disguised as a graphic or media file by assuming a false extension, such as .jpg. Opening files like this allows the virus to infect the device.

Download applications from official stores for smartphones or tablets. Even though many virus attacks still target computers and are more severe due to the volume of data that may be stored on a computer, viruses can also affect smartphones and tablets.

Hope i try my best in answering your question?