Quote (Wikypedia)
"The Tyger" was published as a part of Songs of Experience and the poem can also be seen as dealing with the growing knowledge of the world as one ages. While "The Lamb" is grounded in the Christian iconography of Christ as the good shepherd, "The Tyger" is set in industrialized modernity. The poem in this interpretation reflects a knowledge that evil exists in the world and that benevolence can sometimes appear invisible.
I've studied this poem @ school.
The Tyger is the science that has do be used with much attention cause it can destroy everything instead of helping.
In some ways the Tyger is similar to the Lamb, they both have a very high distructive power but about the tyger is led by the consequences of the risk (caused from the explorations of science during this period) and the lamb (that is the representation of a child) it's distructive in his innocence.
I hope I was clear