Key to producer types & symbols

Brewery: typically this is where the name under which beers are sold is the same as that of the company brewing them. For example, Adnam's, Phoenix. This would also include situations where a brewer goes into another company's premises and uses their plant to brew to his own recipe.
Brand: usually a branding of some beers from a particular brewery that don't bear the name of that brewery. For example, Northern brewery's Blakemere brand or many of the fake brands brewed by Greede King. Also refers to brands of the multi-nationals such as InBev where they don't come from any particular brewery.
Brands normally just get listed under the owning brewery but in some cases, to make them easy to find they get a separate listing.
Beer company: a company which has no brewery plant of its own but has its beers brewed for it elsewhere. This is what Tim Webb refers to as "beer makers without breweries". Generally these are brewed to the contract brewer's own recipe but in some cases they may just be re-badges of the real brewer's beers. An example of a beer company would be Smile's, which has beers brewed for it at Highgate.
Hobby/part-time brewer: someone who doesn't run a brewery as a full-time business, but as a hobby or just brews on odd occasions. Note that some of these are not properly licensed so selling their beers may be illegal (in such situations, they are often given away for charity.)
Normally keg-only: brewers whose products are normally filtered/pasteurised so cannot be classed as "real". In many cases however, they sometimes make limited supplies available in traditional form - only beers that have been reported in this form are listed on Beermad.
Normally bottle-only: brewers whose products are normally just bottled, whether or not they are filtered or pasteurised. In many cases however, they sometimes make limited supplies available in traditional form - only beers that have been reported in this form are listed on Beermad.
Othername: these will occasionally show up where you have searched for a name which isn't the official name of a brewery, perhaps because the name has changed or because the brewery is sometimes known by an abbreviation (for example, Derby Brewing Company is sometimes referred to as "DBC".) Othername entries will just have a link to the full entry, though at some time in the future the Beermad software may be changed so they just redirect to the correct place.