DSL Service.

DSL uses telephone wiring to connect to the Internet. The majority of DSL lines are sold by the local telephone company and generally doesn't work unless you are located within about three miles of your telephone company's central office.

Fiber Optic Internet.

Fiber optic internet is the newest and fastest form of internet connection. It uses thin glass or plastic fibers to transmit data via light signals, offering much higher speeds and lower latency than traditional copper-based networks. Fiber is ideal for businesses requiring high-speed, reliable internet, and is becoming increasingly available in many areas.

Cable Modem.

Historically geared more towards residential customers, cable modem could be a great option if it's available in your building. Comcast is offering attractive new business plans and varying speeds are available.

ISDN.

If you can't get DSL, ISDN is probably the next best thing. It works fine for very small offices (up to maybe 5-7 employees) and doesn't have the same distance limitations as DSL.

T1 Line.

A T1 line is a dedicated pipe between you and the Internet, and works best with larger offices. The problem is that it is significantly more expensive than any of the other options..Dial-Up.No longer practical because of slowness and other limitations.