New figures from the Central Statistics Office show that about 85% of households had access to the internet at home in 2015, up from 82% last year.
The CSO's Information Society Statistics also reveal that 90% of the 16-29 age group accessed the internet every day, compared with 29% of the 60-73 age group.
The CSO said that the main reason for not having a household connection were "lack of skills" and "do not need internet".
Fixed broadband was the most common type of internet access in households, with 77% of people using fixed broadband compared with 38% using mobile broadband.
Today's figures also show that email was the most popular activity carried out on the internet with 84% of respondents saying they used such services.
The next most popular were social networking (66%) and internet banking (64%).
44% of internet users also said they used storage space on the internet to store files - such as documents, pictures, music and video - electronically, up nine percentage points on last year.
Meanwhile, separate statistics from the CSO today show that 64% of Irish businesses used some type of social media - such as Facebook, Twitter and YouTube - last year compared with an EU-average of 39%.
The use of social media by enterprises nationwide rose from 48% in 2013 to 64% this year - the second highest in the European Union and coming behind Malta at 72%. Poland had the lowest usage at 22%.
Today's CSO figures also reveal that 35% of Irish business - with a workforce of 10 or more - bought cloud computing services compared to 28% last year. This was also higher than the EU average of 19% for 2014.
The most popular cloud computing service bought by Irish companies last year was the storage of files at 25%, while 23% of Irish firms bought email services.
According to the CSO figures, 42% of Irish enterprises said they had an ICT security policy in place which could address such issues as the destruction or corruption of data, the disclosure of confidential data and the unavailability of ICT services due to attack from outside.
The figures also show that 53% of large businesses had e-commerce sales which accounted for 50% of their total sales. 28% of small firms had e-commerce sales which accounted for 16% of their total sales.