Euler's method is a numerical technique used to approximate solutions to ordinary differential equations. It works by taking an initial point on the curve and using the slope at that point to estimate the next point. This process is repeated iteratively, creating a series of connected points that approximate the solution. The method is straightforward and involves choosing a step size, which determines how far along the x-axis the next point will be. While Euler's method is easy to implement, it can be less accurate than other methods, especially for larger step sizes or more complex equations.