Broadly speaking, "citation counts" is ta term that describes the measurable times others refer to your work, typically in the format of a citation.
Journal impact factor is a method of measuring the impact of all content of a journal and is a way to rank the impact of that journal on a discipline.
Google Journal Rank
Web of Science
Journal Citation Rank
No database is likely to be able to cover all outputs in all subjects. Bear this in mind when using citation data from different sources.These are competing services.