Applying for an ETA (Electronic Travel Authorization) for Canada is a straightforward process that allows eligible travelers to visit Canada for tourism, business, or transit purposes. To apply, one must complete an online application form, provide personal and travel information, and pay the required processing fee. Once approved, the ETA is electronically linked to the traveler's passport and remains valid for up to five years or until the passport expires, allowing multiple entries into Canada for stays of up to six months per visit.