It is the replacement of imprisonment with another penalty carried out by the convicted person in accordance with the law. 

They are measures imposed instead of pre-trial detention, which the accused must comply with while the investigation or trial is ongoing.

When imposing imprisonment for a period not exceeding one year, subject to the conditions of the law.

They may be replaced with house arrest, either alone or together with another penalty, in specific cases relating to personal or health circumstances.

Yes, if the sentence is imprisonment for a period not exceeding one year or coercive imprisonment.