When we talk about motivation, we mean the drive that leads people to make certain choices, to make efforts and to keep going. Your motivation to learn the target language, to actively participate in learning activities and to take and create opportunities to use the language will be one of the most powerful influences on whether or not you will be actually successful.
I want to help my students be successful, so what does that mean for I? I need to understand what is motivating my students, what can positively or negatively affect their desire to learn and keep learning, and I need to have a range of strategies to protect and positively influence student motivation.
Different learners will have different sets of initial motivations and experience a different range of feelings during their course. In addition, over the sustained, long term effort which developing skills in a foreign language will require, motivation is not constant. It ebbs and flows in complex ways in response to various internal and external factors.
So, given how complex motivation is, what do we know? What can we do to help learners be successful?