The first step of an experiment is generally called the introduction or background. This section sets the stage for the experiment and provides context for the research question.

Here's why it's so important:

* Provides Context: It explains the existing knowledge and research on the topic, highlighting the gaps or unanswered questions that your experiment aims to address.

* Defines the Problem: Clearly states the research question or hypothesis that your experiment is designed to investigate.

* Outlines the Objectives: It describes the specific goals you aim to achieve through your experiment.

While "first step" could technically refer to initial planning or designing, the introduction is the first step in the actual written report or documentation of the experiment.