Mars
Mars is a Solar System planet; its name also denotes a symbolic function in astrology.
How it is defined
Placing a factor in a chart requires a date, an instant and a reference frame. Sign, house and aspect answer different questions: zodiac position, chart sector and angular relationship. They should not be treated as interchangeable.
How to read it
It is used to explore initiative, the urge to act, self-assertion and responses to resistance.
A concrete example
With a difficult task, compare taking a concrete step with reacting impatiently. Both may look quick but have different motives.
Explore further
Read the proposal alongside the actual question and the other factors you really know. This website’s calculators show Sun, Moon and ascendant; studying other bodies here does not mean they are included in those results.