Q1)
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A scatter plot is one of the most basic type of visualization technique that creates a 2D plot and plots the datapoints as circles. (Can change). If added color, size, other dimensions can be displayed.
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Creation (2D): Two dimensions are plotted on the x and y axes. All the data points are then plotted in reference to those dimensions. A scatter plot can have a title, legend, Labels etc to make it more informative. Scales are something one has to work towards.
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Usage: One can use scatter plots when one has to find a relationship between 2 variables. The number of variables can be changed but it is best suited for identifying relationships when the variables are less. One can identify, differentiate, collate etc very