A Mobile app for Government of India's DigiLocker application
DigiLocker is a key initiative under Digital India, the Government of India's flagship program aimed at transforming India into a digitally empowered society and knowledge economy. Targeted at the idea of paperless governance, DigiLocker is a platform for issuance and verification of documents & certificates in a digital way, thus eliminating the use of physical documents. The DigiLocker website can be accessed at https://digitallocker.gov.in/. 

DigiLocker is a online service provided by Ministry of Electronics and IT (MeitY), Government of India under its Digital India initiative. DigiLocker provides an account in cloud to every Indian citizen to access authentic documents/certificates such as driving license, vehicle registration, academic mark list in digital format from the original issuers of these certificates. It also provides 1GB storage space to each account to upload scanned copies of legacy documents.
The beta version of the service was rolled out in February 2015,  and launched by the Prime Minister on 1 July 2015. The storage space provided was 100 MB initially, and was later increased to 1 GB. The individual file size for upload cannot exceed 10 MB.

In July 2016, DigiLocker recorded 20.13 lakh users with a repository of 24.13 lakh documents. The number of users saw a large jump of 7.53 lakh in April when the government had urged all municipal bodies to use DigiLocker to make their administration paperless.

From 2017, the facility was extended to allow students of ICSE board to store their class X and XII certificates in DigiLocker and share them with agencies as required. In February 2017, Kotak Mahindra Bank started providing access to documents in DigiLocker from within its net-banking application, allowing users to e-sign them and forward as needed.
In May 2017, over 108 hospitals, including the Tata Memorial Hospital were planning to launch the use of DigiLocker for storing cancer patients' medical documents and test reports. According to a UIDAI architect, patients would be provided a number key, which they can share with another hospital to allow them to access their test reports.
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As of March 2019, DigiLocker provides access to over 350 crore digital documents from 115 issuers. Over 2 crore users are registered on DigiLocker. 35 requester organisations are accepting documents from DigiLocker.There is also an associated facility for e-signing documents. The service is intended to minimise the use of physical documents, reduce administrative expenses, provide authenticity of the e-documents, provide secure access to government-issued documents and to make it easy for the residents to receive services.
Source : Wikipedia