Citation counts can be gathered for:
The three main tools to generate a citation count include:
You can create a profile with each of these tools to save you time when locating your citation counts.
This citation overview from Scopus is for Albert Einstein:
Citation counts are not perfect and are influenced by a number of factors:
It is not possible to compare citation counts across disciplines and care should be taken when making comparisons within disciplines.
Citations of publications can be counted to provide measures of the usage and impact of the cited work.