Java is a versatile programming language developed by Sun Microsystems, emphasizing principles like 'write once, run anywhere' and object-oriented design. Its various editions, such as Java SE, Java EE, and Java ME, cater to different applications, and Java has gained popularity due to its portability, security, and multithreading capabilities. The language was first introduced in 1995 and has transitioned to an open-source model, enhancing its accessibility for developers.