"Arpeggios are melted chords, and chords are frozen arpeggios". In other words - arpeggios are just notes of a chord played individually, in a row.
Knowing these arpeggios will allow you to locate the root, 3 and 5 of the chord you are playing. This can be used for lead, in order to start lines from, and resolving lines on strong tones.
Keep practicing these shapes, until they become second nature.
These basic arpeggio shapes may also be used in lead to play an ascending or descending sequence - giving your solo a defined, and planned out feel. If you place the arpeggio run in the right spot, it will sound very dynamic and like you planned to make a strong statement.
Here is a C Major 3-note arpeggio. It has the ROOT, 3rd step and 5th step in every octave. The roots are the red notes.
Here is the C Minor Arpeggio (The difference from C Major, is the 3rd is dropped by a semitone)