It depends on the business and to whom you want to get the word out. The best ways, if you have the budget for it, are TV, Radio and Digital Marketing (what order and what platform, depends on the product and market). Even if you have the budget, these venues can be a waste of money if (A) not done right or (B) the ‘word’ need only be spread to a limited audience or over a limited geographic area. There’s no ‘same way’ for all businesses but generally speaking for businesses on modest budgets:

1. Social media; Get aggressive. Do it in house or hire a company that has a department of Social marketing experts like Holbrook Multi Media (oh wait, that's our company!).
2. Local ‘thought’ or ‘social’ influencers/leaders. A word worth spreading is a word that will spread almost automatically once you get it started when started with the right people. Who are the people in your community, celebrities, or even in your own personal circle who would be the best ‘word-spreaders’? Get them started on it. One customer leads to two, two to five, five to ten.
3. Show up! So many folks who start a business think they can generate buzz by sitting in front of their computer. Sure, you have to do that. But nothing beats showing up at places and events where ‘your kind of people’ are also likely to be. Don’t be shy with those business cards. Mingle. At the end of the day, the more people who know you and like you, the more word-of-mouth and business you generate.
4. Sponsor/participate. Look at the calendar and find the events in your area that appeal to ‘your kind of people’. If affordable, be a part of the event. If not, find other ways to participate.
5. Not all customers are the same. What’s the best framework for narrowing in on the customers who matter most for your business?

It’s assumed, you’ve chosen the business you’re in because you have both a knowledge of it and a passion for it. This being the case, you likely have some idea on what types of customers are the ones who’ll matter most to your business. If they ‘matter most’ to you then it also makes sense that what your business has to offer ‘matters most’ to them.