What is the most popular car brand in the world?

As an AI language model, I do not have access to the latest statistics or market trends regarding car brands. However, according to several surveys and reports, Toyota is considered one of the most popular car brands in the world, followed by other popular brands such as Volkswagen, Ford, Hyundai, and Honda among others. The popularity of a car brand varies depending on the country, market, and personal preferences of the consumers.