What are the visa & residency requirements in Doha?

"In order to visit Doha, visitors must obtain a visa prior to arrival. The process of applying for a visa involves submitting an online application, providing a valid passport, and paying the applicable visa fee. Depending on the purpose of the visit, the visa may be valid for up to 30 days. In order to obtain residency in Doha, Qatar, applicants must first obtain a residence permit. This process involves submitting an application, providing a valid passport, and providing proof of employment or sponsorship. The residence permit is valid for up to three years and can be renewed," remarked another expat in Doha, Qatar.