Answer question on the basis of your understanding of the following paragraph and the related studied concepts.
Eletric field around a single charges or a charges configuration can be pictorially mapped by drawing electric field lines in space. An electric field line is, in general, a curve drawn in such a way that the tangent to it at each point is in the direction of the net. field point. An arrow on the curve is obviously necessary to specify the direction of electric field from the two possible directions indicated by a tangent to the curve. A field line is a space curve i.e., a curve in three dimensions.
Electric field lines may be taken to be continous curve without any breaks. Relative density (i.e. closeness) of the field lines at different points indicate the relative strength of electric field at those points. The field lines crowd where the field is strong and are spaced apart where it is weak.
What is an electric field line?

Explanation

An electric field line is a curve drawn in an electric field, tangent to which at any point gives the direction of electric field.