Anyone who visits Canada must apply from outside the country. Your friend or family member must first find out if they need an eTA or a visa. If they need an eTA, they can apply online. If they need a visa they can apply online or on paper. A visa officer will review the application and decide whether to issue a visa. You may provide your family member or friend a letter of invitation in support of their visa application. It should explain how you will help the person. For example, you may offer to pay for plane tickets or accommodation. A letter of invitation can help, but it does not guarantee the person will get a visa.