Composer is a dependency manager for PHP (Laravel). To work with Laravel we have to install Composer.
Note: Before install composer, check extension=php_openssl.dll line is uncomment in wamp\bin\php\php5.6.26\php.ini and also check during composer install that path is yourdrive\wamp\bin\php\php5.6.26\php.exe
1.Download Composer-Setup.exe from https://getcomposer.org/download
2.Open downloaded Composer-Setup.exe then click next->next->do not download shell next->select yourdrive\wamp\bin\php\php5.6.26\php.exe->next->install->next->finish.