How to find out: 32bit or 64bit?

What does this 32 bit and 64 bit mean?

32-bit and 64-bit refer to the type of CPU, OS,  software program, etc. that utilizes that particular architecture.  32-bit hardware and software is often referred to as x86 or x86-32. 64-bit hardware and software is often referred to as x64 or x86-64.

Well, I tried downloading Google chrome in Ubuntu.

But, how do I know whether my processor is 32bit or 64 bit?
To know:

Open your  terminal and type:

$ uname –m
i686

If the response is i686, you have a 32-bit version of Linux.
If the response is x86_64, you have a 64-bit version of Linux.
You can find out more detail about your particular installation of Linux, like your kernel version, by entering

$ uname –a
Linux 11CPU0101L 3.0.3 #1 SMP Thu Aug 25 15:34:43 IST 2011 i686 GNU/Linux

You can find your CPU info by typing

$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 23
model name	: Intel(R) Core(TM)2 Duo CPU     E7500  @ 2.93GHz
stepping	: 10
cpu MHz		: 1600.000
cache size	: 3072 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority
bogomips	: 5852.32
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 23
model name	: Intel(R) Core(TM)2 Duo CPU     E7500  @ 2.93GHz
stepping	: 10
cpu MHz		: 1600.000
cache size	: 3072 KB
physical id	: 0
siblings	: 2
core id		: 1
cpu cores	: 2
apicid		: 1
initial apicid	: 1
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority
bogomips	: 5851.83
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:

And finally, to know whether Linux kernel is 32bit or 64bit, type

$ getconf LONG_BIT
32
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