In what language can background processes be made?

Question

Windows

you need something that works on the example of an antivirus.

Answer 1

1. In any language, you can make a background process.
2. What does an example of an antivirus mean? many antiviruses work like regular programs - launched, scanned, closed.
3. Read what services are in Windows and how to create your own, for example, with the sc command
https://windowsnotes.ru/cmd/sozdanie-sluzhby-v-windows/