A flowchart is a diagram that represents an algorithm, workflow, or process through a series of boxes and connecting arrows. It shows the steps of a process and the order they occur in. There are different types of flowcharts like document, data, system, and program flowcharts. The basic steps for constructing a flowchart are to define the process, brainstorm activities, arrange activities in sequence, draw arrows to show flow, and review with others. Flowcharts can be macro, top-down, or micro level depending on the amount of detail shown.