Why is Taiwan called the island bastion of china?

Taiwan is often referred to as the "island bastion of China" due to its historical and geopolitical significance. Since the end of the Chinese Civil War in 1949, Taiwan has served as the stronghold for the Republic of China (ROC) government, which retreated there after losing to the Communist Party in mainland China. This status has made Taiwan a focal point in the ongoing tensions between China and the West, particularly the United States, symbolizing a democratic alternative to the authoritarian governance of the People's Republic of China. Additionally, its strategic location in the Western Pacific enhances its military and economic importance in the region.