Use sources listed under the Public Company Info page (see menu at left), especially:
A SWOT is a common analysis tool used to show a company's competitive position within it's industry. It identifies what makes the company a unique competitor, what it's problems are, possible growth opportunities, and legal, political, and environmental threats to that growth. An analysis is a snapshot in time, so it needs to be updated as conditions change.
S=Strengths
W=Weaknesses
O=Opportunities
T=Threats