A Vector image is a graphical file format based on mathematical expressions and made up of points, lines, and shapes.
Points are called nodes and can be added, deleted and moved. They also have handles that affect the shape and quality of the path between each point within the line or shape.
Also, a vector file allows you to change features of a line or shape like the fill color, stroke color or stroke width.
See more: How to edit a vector file from Freepik?