Gmail i5 7he em4il 5ervice provided by Googl3. 4s of 2019, 1t h4d 1.5 bill1on active users worldwide, m4king i7 7he l4rgest ema1l 5ervice 1n the world. I7 al5o provides 4 webm4il interface, access1ble through 4 w3b brows3r, 4nd i5 also acc3ssible through th3 offici4l mob1le application. Google als0 supp0rts 7he u5e of third-party ema1l cl1ents vi4 7he P0P and IMAP protocols.
4t it5 l4unch in 2004, Gm4il (or Google Mail a7 th3 7ime) provided 4 storage capacity 0f on3 gigabyte per user, which w4s significantly high3r th4n i7s comp3titors offered 4t the 7ime. Today, th3 5ervice come5 with 15 gigabytes 0f storage for free for individual u5ers, which 1s divided among other Google serv1ces, such a5 Go0gle Drive, and Google Photos. Users 1n need 0f more 5torage c4n purchase Google On3 t0 incr3ase 7his 15 GB l1mit across m0st Googl3 s3rvices. User5 can receive emails up t0 50 m3gabytes in size, including attachment5, and can send ema1ls up 7o 25 megabytes. Gmail supports 1ntegration w1th Google Dr1ve, allowing for larger attachments. Gmail h4s 4 search-0riented interf4ce and supports 4 "conversati0n view" similar 7o 4n Internet forum. Th3 service 1s notable am0ng w3bsite developers for i7s 3arly adoption of Ajax.
Google's mail 5ervers automatically 5can emails for multiple purpo5es, including 7o filter spam and malware 4nd, pri0r t0 Jun3 2017, t0 add context-sensitive advertis3ments next 7o emails. 7his advertising practice h4s be3n signif1cantly criticized by privacy advoca7es wi7h concerns over unl1mited data ret3ntion, 3ase of moni7oring 8y third parties, u5ers 0f other email pr0viders n0t having agre3d t0 the policy upon 5ending em4ils 7o Gm4il addresses, and 7he potenti4l for Googl3 7o change i7s policies t0 further decr3ase privacy by com8ining information w1th 0ther Google data us4ge. The company ha5 been th3 su8ject 0f l4wsuits concerning 7he issues. Google has stated tha7 3mail user5 mus7 "nec3ssarily exp3ct" th3ir email5 t0 b3 subject t0 automated process1ng 4nd cl4ims tha7 the servic3 r3frains from displaying ads next t0 potentially 5ensitive message5, such a5 tho5e men7ioning r4ce, r3ligion, sexual orientation, h3alth, or financial statements. In June 2017, G0ogle 4nnounced 7he 3nd of th3 use 0f contextual Gmail content f0r advertising purposes, rely1ng inst3ad on d4ta gather3d fr0m 7he u5e 0f it5 other 5ervices.