Market share analysis indicates how well a firm is performing compared to competitors. It considers factors like unit sales, user base, market definition, competitors included, and time frame to estimate a firm's market share. A complete analysis requires determining the total market size, growth rate, market share breakdown, market segmentation, key players in each segment, SWOT analysis of strengths and weaknesses, emerging opportunities and threats, business continuity plans, and setting a target market share based on the analysis.