Gulp – The streaming build system

gulp.task('sass', function() {
  return gulp.src('src/styles/main.scss')
    .pipe(sass({ style: 'compressed' }))
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(gulp.dest('dist/assets/css'))
});

Gulp is a build system and performs tasks such as the ones we do using Grunt: minify, concat, prefix, uglify, etc. Main difference:

Gulp allows you to input your source file(s), pipe them through a bunch of plugins and get an output at the end, rather than configuring each plugin with an input and output—like in Grunt.

Must say that the gulpfile.js embedded below is more readable than its gruntfile.js counterpart where you have to jump through the file when first glancing at it.

Gulp →
Getting started with Gulp →