Nokia failed due to several reasons, including its inability to keep up with the changing market trends and consumer preferences, particularly the shift towards smartphones. The company also failed to effectively compete with rivals such as Apple and Samsung, who dominated the market with their innovative and popular products. Additionally, Nokia’s decision to stick with its proprietary Symbian operating system while rivals embraced Android and iOS also contributed to its downfall. The company’s slow response to these changes ultimately led to declining sales and loss of market share, leading to its eventual acquisition by Microsoft.