E-1 Visa:

The E-1 nonimmigrant classification allows a national of a treaty country (a country with which the United States maintains a treaty of commerce and navigation) to be admitted to the United States solely to engage in international trade on his or her own behalf. Certain employees of such a person or of a qualifying organization may also be eligible for this classification.

E-2 Visa:

The E-2 nonimmigrant classification allows a national of a treaty country (a country with which the United States maintains a treaty of commerce and navigation) to be admitted to the United States when investing a substantial amount of capital in a U.S. business. There is no set minimum investment required. The regulations state only that the investment must be sufficient to develop a successful, non-marginal business.

Certain employees of such a person or of a qualifying organization may also be eligible for this classification.

Benefits of the E Visas:

Allow foreign investors from over 75 countries, signatories of an investment treaty with the U.S., to establish, develop, and operate a business of their choice in the U.S.
The E visa holder may travel abroad and will generally be granted an automatic two-year period of admission when returning to the United States.
E visa holders may be accompanied or followed by spouses and unmarried children who are under 21 years of age. Their nationalities need not be the same as the treaty trader or employee.
The spouses of the E-2 visa holders may apply for employment authorization and work in the U.S. and obtain a social security number.
The dependents of E visa holders can study freely in the United States without seeking further approval. Children may attend public or private school, while spouses may attend any level of schooling.