A trend is a pattern of behavior demonstrated by a big number of people within a particular period, which can also refer to movements, ideologies, concepts, beliefs, and more.
A fad is a pattern of behavior which is described as an intense enthusiasm for something for a short period of time, also known as rage or craze.
Trends are currents and fads are waves.
Trends refer to the way we do things and the new things that we currently do fade when the perception of novelty is gone.
Trends are sustained behavior that turns into lifestyle, mindset, and values.
Fads meet needs, solve problems, and issues, but can also cause coolness and me-too mentality.
Trends get stronger overtime and stick around, while fads suddenly disappear.
Microtrends are “little things” that happen around us all of the time.
Macrotrends societal level for a longer period.
Megatrends are macrotrends that have grown up and moved out, ''they can last for decades'' and are “so pervasive as to be generally known”.
Gigatrends are trends that affect most areas of human life .
Trendspotting refers to the study of trends and "the way they develop and affect society".
Trend Analysis is based on trendspotting but it extends this into developing future scenarios and so it requires being conscious of what is currently happening and predicting the future.
A trendsetter is someone or something "who starts or causes a trend".