Here's why:
* Objectivity: Expository writing aims to present information in a clear, unbiased, and factual way. Using first person can introduce personal opinions or biases that might detract from the objective tone.
* Focus on information: Expository writing focuses on presenting information, not on the writer's personal experiences or feelings. Third person allows the writer to maintain a neutral and detached stance, focusing on the information itself.
* Clarity and professionalism: Using third person enhances clarity and professionalism. It helps readers understand that the information is based on evidence and facts, not on the writer's personal perspective.
However, there are some exceptions:
* Personal essays: These often use first person to tell a story or share a personal experience.
* Opinion pieces: While still expository in nature, opinion pieces sometimes use first person to express a particular viewpoint.
In general, when writing expository essays, reports, or other informational texts, it's best to stick to the third person to maintain objectivity and clarity.