上网 (pinyin: shàng wǎng, written "shang wang" or "shangwang") means to go online. Below: its meaning, pronunciation, stroke order, and example sentences, so you can learn how to read, say, and write 上网.
Meaning
to go online
to connect to the Internet
(of a document etc) to be uploaded to the Internet
(tennis, volleyball etc) to move in close to the net