Webster's Dictionary is a well-known dictionary published by Merriam-Webster. Dictionaries by other publishers have been published under the Webster name, but authentic Webster dictionaries bear the Merriam-Webster name as of 1982.
Merriam-Webster periodically publishes a number of paper dictionaries and also maintains an online dictionary that is free to access as of May 2015. The online dictionary is based on the current print version of "Merriam-Webster's Collegiate Dictionary." Most of the content is reproduced online, but certain sections such as "Signs and Symbols" are exclusive to the print version.
The first Merriam-Webster dictionary was published in 1847 and the company has been in continuous operation since then.