A line graph which is a whole unbroken line is called a:

Linear graph

A linear graph is represented in the form of a straight line.

A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion.

A histograph, also known as a frequency polygon, is a graph made by connecting the midpoints of histogram column tops.

A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent