The sequence "a, a+d, a+2d, ..." is known as an arithmetic sequence. In this sequence, "a" represents the first term, while "d" is the common difference between consecutive terms. Each term is generated by adding the common difference "d" to the previous term. For example, if a = 2 and d = 3, the sequence would be 2, 5, 8, 11, and so on. Arithmetic sequences are widely used in mathematics and can be found in various real-life situations, such as calculating total costs or predicting future values. The formula for the nth term of this sequence is given by a + (n-1)d, where "n" is the term number.