What does a'?

What are you trying to ask? I can only assume one of the following:

Something Equestrian related like "What do you do in an equestrian event" or "What does equestrian mean"

If this is the case, Equestrianism is simply the art of horse riding an equestrian events come in many variety based on skill of riding, driving, steeplechasing or vaulting with horses

Something referring to a question in which case your question is rather paradoxical and pointless. Nevertheless I aim to please so...

A question is a means to obtain information that the subject does not itself knows and so must endeavour to seek this information. A question might be verbally asked, written down, typed on the internet for people to rather irritably answer or thought about. Although this form of questioning is by its supporters and philosophers will refer to as pondering the great questions of life and the universe. To everyone else we call it daydreaming.