The automotive industry is a highly competitive market with numerous players vying for market share. To determine the biggest car manufacturers in the world, we need to consider factors such as global production volume, revenue, and market presence.

1. Toyota Motor Corporation (Japan) - With a global production capacity of over 10 million units per year, Toyota is widely considered one of the largest car manufacturers in the world. Founded in 1937, Toyota has expanded its product lineup to include hybrid vehicles and electric cars.
2. Mazda Motor Company (Japan) - Mazda's market share in Asia-Pacific region is estimated at around 5%, making it a significant player in the global car industry. The company was founded in 1920 and is known for its high-performance sports cars.
3. General Motors Company (USA) - With over 7,500 dealerships worldwide, General Motors is one of the largest automobile manufacturers globally. Founded in 1908 by William C. Durant and Charles Stewart Mott, GM has expanded its product lineup to include electric vehicles and self-driving cars.
4. Ford Motor Company (USA) - Ford's global presence is evident through its extensive network of dealerships and manufacturing facilities across the world. Founded in 1903 by Henry Ford, the company is known for its iconic models such as the Mustang and F-150.

The top five car manufacturers in the world, based on market share, are: Toyota Motor Corporation (Japan), with a global market share of around 23.1%; Volkswagen Group (Germany) - with a global market share of around 18.6%, followed by General Motors Company (USA) - with a global market share of around 10.4%. Mazda Motor Company (Japan) and Ford Motor Company (USA) round out the top five.