Capitalism's main focus is economic growth, which proponents claim will lead inevitably to the prosperity of individuals.
Capitalism's main focus is protection of private property and individual liberty.
I wouldn't necessarily lump individual liberty in with private property, there seems to be some debate on that matter.
From Wikipedia on Capiltalism:
The relationship between democracy and capitalism is a contentious area in theory and popular political movements. The extension of universal adult male suffrage in 19th century Britain occurred along with the development of industrial capitalism, and democracy became widespread at the same time as capitalism, leading many theorists to posit a causal relationship between them, or that each affects the other. However, in the 20th century, according to some authors, capitalism also accompanied a variety of political formations quite distinct from liberal democracies, including fascist regimes, monarchies, and single-party states, while some democratic societies such as the Bolivarian Republic of Venezuela and Anarchist Catalonia have been expressly anti-capitalist.
While some thinkers argue that capitalist development more-or-less inevitably eventually leads to the emergence of democracy, others dispute this claim. Research on the democratic peace theory indicates that capitalist democracies rarely make war with one another and have little internal violence. However critics of the democratic peace theory note that democratic capitalist states may fight infrequently and or never with other democratic capitalist states because of political similarity or stability rather than because they are democratic or capitalist.
Some commentators argue that though economic growth under capitalism has led to democratization in the past, it may not do so in the future, as authoritarian regimes have been able to manage economic growth without making concessions to greater political freedom. States that have highly capitalistic economic systems have thrived under authoritarian or oppressive political systems. Singapore, which maintains a highly open market economy and attracts lots of foreign investment, does not protect civil liberties such as freedom of speech and expression. The private (capitalist) sector in the People's Republic of China has grown exponentially and thrived since its inception, despite having an authoritarian government. Private investment in Fascist states, such as Nazi Germany, greatly increased, and Augusto Pinochet's rule in Chile led to economic growth by using authoritarian means to create a safe environment for investment and capitalism.
In response to criticism of the system, some proponents of capitalism have argued that its advantages are supported by empirical research. For example, advocates of different Indices of Economic Freedom point to a statistical correlation between nations with more economic freedom (as defined by the indices) and higher scores on variables such as income and life expectancy, including the poor, in these nations.