Michael Faraday, a great physicist of the 19th century, found it convenient to represent electric fields through lines of force, whose construction is quite simple.
Lines of force due to a point load
Lines of force are straight lines from the position of the load in all directions, as shown in the figure below.
Lines of force produced by a pair of charges
When the field is produced by more than one charge, the lines of force make sense as shown in the figure below, in which we can see the situation of two charges placed next to each other. Lines of force always depart from positive charges and arrive at negative charges.