Dear Student,
Let us take two neutral conducting spheres and then bring a negatively charged balloon near to (without touching) the left sphere. This negatively charged balloon forces electron movement from the left sphere to the right sphere. With the result of this spheres get polarised. Excess positive charge appear on the left sphere and negative charge on the right sphere. When the spheres are separated and the balloon is removed, the two spheres display a charge. The left sphere ends up with a positive charge (the opposite type of charge as the balloon). The right sphere ends up with a negative charge.
Regards